It's called LSD and was 'discovered' and used in the sixties. Oh- the side effect is that it gives you 'new' bad memories.

I heard about this discover, but I prefer keeping my bad (and painful) memories and being myself: it would be like loosing part of my story and don't know anymore who I am.

Exactly, farfalla294'. It;s our past experiences - good and/or bad - that define who we are in this moment. The fact that there is a drug to erase bad memories, AND the fact that some people will desire that drug, is a sad thought.
zenu1luv

Now, at long last, i can sit down 2write my memoires