Sorry to hear you're having a tough time of it Jose, if you want to know how easy it is to confuse yourself the consider my last comment about being in Re-Observation....I realized a few days later that it was actually the 3rd ñana of this path although the instability, mental anguish, anxiety and anger were far worse than
what I expected or had experienced from this stage since pre-Stream Entry (if that's even what happened!) so, sorry Claudiu, but I'd still say that you're firmly in 3rd ñana. Again, I'm just skeptical due to having messed up plenty already with this stuff myself so I'd rather underestimate than try to fit information to what I "think" about these stages. I just had an unpleasant but informative lesson on what happens when you "think" too much.

You won't end up feeling like a puppet. You'll realize through direct experience of it that you've been a puppet the entire time, vipassana is the scissors you'll use to begin cutting the strings and becoming free. I can see from your writing that you're inclined to over-intellectualize your experience of the world, but this is what's happening: You're experiencing the beginning of seeing through this whole thing. That thing you call a self is getting worried now, manifesting anxiety, fear, panic and distress as it begins to see that you're trying to loosen it's suffering-inducing grip on your experience. The choice from here is clear, you either give up and go back to normal, and there's nothing wrong with that at all, you might even come back to it when you're more psychologically ready, or you face up to the sometimes harsh realities of spiritual development, and you'll find them in every single (effective) system of attainment, realize that even these horrible, negative feeling are transient, not this "self" you think you "are", and will never satisfy you in any way. This is the way to insight, there is no other Path so clearly mapped, so verifiable and effective than the one you're treading right now. I don't want to sound too dramatic (too late!) but it's time to make a choice. If you continue then it's the A&P followed by Dark Night, if not then just do what's right for you and be honest with yourself. If you choose to stop, it's been good talking to you and I wish you well in anything life brings your way. If you choose to continue then read on.....
Don't worry to much about examining the 3C's individually, just note the sensations as they happen, if you're focusing on one part then you're missing the other two which occur and are just as important. I've made the same mistake too, Kenneth Folk recently pointed out to me that the 3C's are a conceptual framework. I thought about this quite a lot and realized that we don't note "impermanence", "Not self", or "suffering", we note sensations arise and pass, we note them as objects so they can't be this "self", and we see how no satisfaction can be had from any sensation as they don't stick around for more than a split second. That's the 3C's in real-time, not as a concept, and they can be experienced in every single sensation which can be observed. You're putting too much emphasis on the concept, and I think I'd be correct in saying that you've interpreted this in a rather nihilistic light, and not enough on the experience. Yes, there is no such thing as self beyond the sensations experienced by this "observer" on a momentary basis. Yes, all sensation will arise and pass. Yes, there is only suffering, fundamental, dualistic suffering, the ROOT of suffering (not just "thinking" you feel like shit) to be found in EVERY SINGLE sensation, no matter how lovely and sexy, violent and nauseating, depressing or manic it feels. Don't think "Oh woe is me, this world is impermanent, I have no self and don't exist, these thoughts are not the property of this self called "Jose"", Jose still exists, he's not going anywhere but you begin to see that "Jose" is actually a series of sensations, just flickering thoughts and vibrations, in the most beautiful way if you just pay attention to the goddamned sensations, not the concepts.
To stick with the Matrix metaphor, you're Neo but rather than taking the pill straight away, you're getting a quick look at what's likely to happen after you take it. Remember how I said that it's not an easy path? Well, now you're seeing this for yourself but, even though you can't see it yet, it's changing your perception of the world in a way which is actually cleansing. Like when Neo first wakes up inside the slime-egg thing, he goes mental and doesn't believe any of it but, slowly, he learns to function with this new insight into the nature of reality. It's a painful, slow process
sometimes but it will change. If solid practice, and I mean a regular routine of vipassana every single day, no matter how difficult and worthless it feels sometimes, doesn't change anything at all about your relationship to these sensations then, if you feel it necessary, seek medical attention but I really do think that this will not be the case.
The reason people on places like here and KFDh discuss this stuff is that we want to share our experiences of these stages, the heavenly and the hellish, to help people and to be helped, to openly talk about how incredibly shitty these stages of insight can truly be and to help one another to avoid making mistakes. We've all been there to some extent, have a look at my practice thread over at
KFDh and you'll see what's happening in my practice right now. It's not all fun and games, sometimes it's rough but you need to be there with it as it happens to get insight regardless of how awful it feels sometimes.
Take a break, there's no rush. Maybe just work on your concentration if you still want to maintain a routine, just work at your own pace. Ideally you want to maintain a solid routine at this point but if you can't manage then don't beat yourself up over it. Do some meditation on metta, go read some Jack Kornfield, get into the more compassionate practices until you feel ready. Just remember that there's plenty of people on here who've been where you are, and if you continue to practice then you'll be able to help someone else one day and see things more clearly. Ask questions, stop feeling sorry for yourself and note like a motherfucker!

Good luck and keep us updated!