Hi Kinga,
Welcome to the Dharma Overground and welcome to vipassana life. You've found a very helpful and valuable place on the internets. Unlike myself there are some very experienced meditators here who will hopefully chime in and help you along as good as possible.
I felt the urge to reply to your post because I can very much relate to it. I thought I'd tell you a bit of how I've been dealing with it, maybe it is of some help or at least gives you some reassurance.
Kinga M:
Hi everyone,
I was struggling with anxiety, sadness, fear, feeling of guilt, anger towards myself... - everything I could possibly imagine. I think at the same time I was pushing myself too hard.
Kinga M:
I have a feeling that i have some kind of insight to my own pain and pain of others and I can't be happy anymore. I feel like I'm more aware of others but at the same time I don't want to talk to them, like I have nothing to talk about... Emptiness, very sad.
I've been experiencing these things in daily life ever since my first retreat some time ago (don't be discouraged, some people get through this in a matter of weeks or days, it's very personal). Difficulty to focus, angry, hateful thougths, weakness, misery, emptiness, low self esteem, fear, anxiety.
Indeed they say it's dark night (however some psychological difficulties might be intertwined) and the only way out of it is to keep meditating and reach stream entry.
I have been getting cognitive therapy to deal with these difficulties in daily life and to conquer the depression and social anxiety i got from this (WTF is wrong with me?), wich has been really helpful to deal with negative thoughts (it's just thought, not very much truth to it). But although helpful it very much feels like dealing with the symptoms rather than the root of the problem. It helps in daily life, but not meditating does not seem to be an option.
Kinga M:
(...) But I can't live like this...
note: self pity, drama, exaggeration.
Well, actually you can. You're very much up to it. You'd be surprised.
Despite this negativity I started an education and a job as a high school math teacher, and although managing a classroom with 30 teenagers might sometimes feel like hell in a state of mind like this, I've been doing quite ok. Not so much problem about it really, I'm doing a decent job.
Also, it might be a pretty intense experience for you, but other people mostly won't notice it about you (wich for me seems pretty hard to believe, but I've checked it ;-). You can just keep doing the things you do. So try not to be hard on yourself. Guilt is not justified, nor helpful for that matter.
On the good side, dark night has been challenging me and helping me very much to develop compassion for myself and for the people around me. Metta meditation has been very soothing for me, helping me to befriend misery and make less and less fuss about it.
But alas, without reaching stream entry it seems that misery will be a returning visitor (if you accept it and start paying attention, you will notice how it has a rythm to it). Good for you that you've allready found the noble eightfold path and some sources of guidance to walk it. My humble advise would be to make it your main journey in life, as accomplished meditators all say that in the end it's the best thing they've undertaken by far.
Hope I've been of some help. Either way, good luck to you.
Noah
PS. Your english is actually very decent. The story isn't too long either.
So no need to apologise, in general, whatsoever

TL;DR Shit happens, start noting it.