I'd agree with Bruno, this sounds like an A&P which can give one the impression that they're now enlightened, or at least more realised than they actually are. Whether you like it or not, the A&P is followed by the Dark Night which certainly does not:
Trying to place yourself on the map of the stages of insight based on memories from two years previously and with no experience of any other models of spiritual progress, particularly claiming to have attained something close to enlightenment, will set you up for a fall. I know this because I've been there too. The state you've experienced is something which can be reached again through insight practice. Once you've sat down, got your concentration in order and began noting every sensation that arises and passes within your sensory experience of reality you will pass through distinct stages of insight and inevitably experience the same, or at the very least similar sensations to what you've experienced before.
I'm not trying to disparage your claims or dampen the obvious emotional impact that the experience had on you, but you're becoming lost in the content of what occured rather than examining it for what it is. I'm sure many of us on here who have put these techniques into practice could tell you identical stories about feeling one-ness with everything, "100% acceptance" of all the suffering in the world and all manner of blissful, A&P related tales.
What i experienced seems to be exactly correct with how osho describes enlightment;
From other descriptions of enlightement - i don't think what i achieved was state of non-duality.
So what do you think enlightenment means? You say you don't think you acheived a state of non-duality which would lead me to believe that you haven't attained enlightment.
What made this state dissapear was probably urge to maintain this state.
Impermanence: You realise that this state is not a constant change in perception or awareness. It has arisen, it has passed.
Suffering: The urge to stay in that state and hold onto it will lead you to suffer the desire to re-enter it. Even when you do enter it again, it will arise and pass and until you realise this you will be stuck at that level.
Not self: What you experienced is not you, nor is it a part of you, nor is it something you own. It's a state which exists and can be experienced by using the correct techniques. If you identify with it and believe it to be part of you, you'll miss the point because it will only arise and pass like every other sensation.
If you had even attained stream entry then such a shift in awareness would be permanent and require no effort to maintain. Even then it's still not enlightenment but you'd at least be on the right path.
I am unable to back to "normal life", even though it happened 2 years ago and i didn't achieved anything even close to it (but i started to meditate about week ago), and while meditating - i'm progressing very quickly.
What do you mean by "normal life"? Do you mean your day-to-day environment? Your job? Relationships? If so, this sounds like what Daniel refers to in MCTB as a "bleedthrough" during the Dark Night which, in my humble opinion, would probably be a fair approximation of 'where you are' as the Dark Night can last years until we learn to see the way out. If you want the advice of someone else who is new to this site, the terminology and these very effective and time-served techniques then go learn about vipasanna and start practising immediately.
To be "progressing very quickly" suggests that you know where you started, where you are at present and where you're headed. In what way are you progressing quickly?
I wonder, do you people simply follow your regular lifes after achieving further stages?
When i was experiencing what i described, i felt exactly same love to every single person. I wouldn't be able to be in any kind of 1-1 relationship, for example.
Don't use this experience as an excuse to fuck around if you're in a relationship, mess your friends around or treat people who haven't experience the A&P with disrespect or as lesser beings. Been there, done that, looked like a cock and payed the price for it. Seriously. Use this lesson and learn to be a loving and compassionate human being.
As for simply following a regular life, I can only speak for myself based on my own experiences and what I've learned from the wisdom of those much further advanced than I am on the path: The lessons we learn, the insights and realisations must all be integrated into our daily lives because, regardless of our level of attainment, we're still human and unless we choose a monastic life from here on in then we still need to be able to function as 'normal' members of society. If you chose a monastic path then it's your choice and that's what I used to think you needed to do to become enlightened until I understood what enlightenment is.
I'm just a guy on the internet who's working towards enlightenment like everyone else on this site. I'm making no claims to having attained anything other than the understanding that practice of vipassana and the understanding of the Three Characteristics will, with hard work and effort, lead to enlightenment.
Put what happened in perspective. Accept that you have experienced that there is more to reality than you were previously aware of but don't try to say you're an enligheneted being until you actually understand what enlightenment is. I don't believe that you can experience "something that felt close to" enlightenment without first understanding what enlightenment is and what actually occurs on entry into that stage of the path. Until we experience it for ourselves we're only ever creating ideas which bear no resemblance to the truth and are based on what you
think it would
feel. If you think it, it's a thought. It's not self, it arises and passes like all other thoughts, and your misunderstanding of enlightenment will only bring suffering as you will continually miss the point of the essential insights you can gain during meditation.
Remember, I'm just someone else who's new to this site and the specific practises discussed in Daniel's book. What I say is purely an opinion and I could be completely wrong but having interpreted similar experiences in unrealistic ways in the past, and now having the fortune to have come across this site, I can say that I understand where you're coming from. There are people on here who know a lot more about this than I do and it's your responsibility to educate yourself and learn from those who have walked the path before you.
Good luck with your searching and please keep your feet on the ground.
Tommy