I've used so many tools at work so this is a long list.
Attenuating the emotions with vipassana up to equanimity and beyond is quite helpful. I would continue noting during work (especially during unpleasant sensations). Concentration is nice but I find the final practices are more helpful when reading or working on problems. The intention and force to concentrate can also be a stumbling block. "Why isn't the concentration working?! Why I'm I thinking so much when I'm reading? Ahhhh!" LOL.
Return to the sourceStriving in your mind for concentration can also be the same kind of striving to meet a deadline in your mind. It's agitating. I used to read and force concentration but it wasn't as good as letting the automatic senses work as they are. Just looking at a page to read I can just let the mind do its thing. When you start out and the reactivity is large it seems hard to do but when you use vipassana to see sensations, thoughts, and emotions arise and pass away over and over again you gain equanimity over the process and eventually negative tensions start to melt and lose their strength. It's important to note (FEEL) the 3 characteristics (especially dissatisfaction from the tension caused by craving and clinging) to develop dispassion to mental attachments. Clinging is like the mental image/talk after the craving arises. The final practices help you melt tension related to attachments to meditation attainments so you can actually see how far you've come over the years. It takes years but it's worth it. Do the last practices and the preliminary ones to see where you are going and if you find the final ones good enough then just stick with those. In the end you should just look at problems as activities to deal with and anything you have no control over you have to accept. Daniel Ingram's MCTB noting descriptions along with Mahasi Sayadaw's instructions helped me greatly at work and dealing with difficult people. I could be insulted in front of other people at work and I could keep my composure despite the reactivity and maybe respond with something funny or move on like nothing important has occurred. At first when you note negative reactions it works only a little bit but after diligent practice over a length of time I could deal with angry and insulting people with much less reactivity. Seeing the dissatisfaction part of the 3 characteristics is very important and the noting must emphasize awareness of the sensation more than the word label.
This is another good common sense guide on noting properly:
Gil Fronsdal - NotingConcentration is a form of repression so there are benefits to it but if you try to understand your reactivity with insight practice you will want to get to the point where your stress at work is just another thing that arises and passes away and you are able to accept tiredness and frustration instead of having to nuke it away by focusing on your keyboard.
It's also important to look at the good in what is bad and the bad in what is good to develop a larger spectrum of reality. Sometimes responsibilities are irritating but the result of completing them is quite pleasant. Addictions seem pleasant in the short-run but it's important to develop some disgust with negative mental habits and I would also recommend loving kindness practice to help stabilize the mind while you pursue an insight practice. It helps with ill will and aversion. When I get aversion I can feel a contraction in my chest and my willpower decreases but just by looking at it with mindfulness and waiting for the tension to melt away on it's own (acceptance) that willpower returns. That way I don't have to repress negative sensations with concentration but just let it go away naturally. Dispassion (seeing 3 characteristics clearly) is the key to reduce the strength of the reactivity. Then seeing the value of sticking it out with difficult projects can help with the desire which will motivate action.
BTW this practice can make you feel so satisfied that you may want to quit work or neglect challenges. Despite what is taught in Buddhism I would actually allow some of your career goals to be concentration practices. Desire appears when some projection in your mind brings up something that is desirable and that desire motivates willpower. You can see dependent origination in action when you notice a craving or aversion and then some sound or image appears in your mind and then the desire or aversion strengthens like a steam engine that needs release with action. To avoid getting too lackadaisical it's good to think of a difficult project and imagine the enjoyment of completing it. The longer you keep those goals in your imagination it can trigger strong desire which can overcome some of the aversion you might feel. If you cultivate healthy desires it will keep you from thinking that enlightenment will make you successful at work. It won't. It helps with reframing problems so that they are less rigid and feel more like organic processes. Some people think playing chess will help them with work but you could be a chess master and sleep on a park bench.
Shinzen Young MindfulnessThere was a link that I think
Tarver Jeff Grove had in another thread
but I forgot about it.
Maybe he will chime in. It was about non-dual practices and I found they nudge you in the right direction. I got lots of relief, for example, to look at an object and locate my typical sense of self behind the eyes and then close my eyes and use the "self" as a concentration object. That puts you into your automatic senses after a while.
Awareness watching awarenessI would also look at some of what Nick Halay has posted on apperception/Dzogchen and Actual Freedom practices. I'm not entirely convinced that this would be good to make permanent but there are others who are convinced and are quite advanced in the practice. It depends on how satisfied you get with your other practices but I am convinced with my limited experience at least it can create great reduction in emotional suffering for an extended period of time. The way the brain works is that as soon as your senses zoom in and objectify an object it naturally wants to decide whether it's good or bad and your amygdala will respond. Now if you don't zoom in on objects as much and your actions are simply done because they are useful. Noting HAIETMOBA (How am I experiencing this moment of being alive) is like noting all your automatic senses (including automatic thoughts) at the same time which can be like a switch. As soon as you start zooming on something and objectifying it then the results start vanishing. I've used this in recreation but I haven't really used this at work yet.
The Yogi toolbox HAIETMOBAHAIETMOBA WikiFinally I found a thread that Stian started that led me to Gendlin. What I find fun now is when there is a reactive bit of anxiety over something (like feeling generally spooked or negative about some state of affairs in my life) instead of investigating the 3Cs I can actually just look at what it's telling me. Just being compassionate about the impulse and trying to understand it quickly reduces the suffering and gives you basic knowledge about what your impulses are telling you. "Hey you are delaying an important choice that you need to act on soon!" Then of course if you use it to act on it then that impulse should recede and hopefully the action was necessary. If the impulse is bullshit and you can see that logically then the logic should do away with it. "If I have trouble with this project I'm a loser!" "Ah..no that's not logical" "Oh. Ok".

These practices have all helped me and still do.
Good luck in Nepal!