My knowledge on this says that when you experience some sort of overwhelming stress you actually suffer brain damage, not major, but your brain lets your primitive, "reptilian" brain take over for a while until you recover. Its like you're operating on instinct, because you are, that's what that part of your brain does. It takes time but the other side will gradually reassert itself, at first you wont recollect, or well, the details of whatever caused the overwhelming stress without it plunging you back into reptilian brain mode, but gradually you get longer spans of reasoning mind, shorter spans of the other and an ability to recollect with reverting. Could be you do all this rationalising, objectively your mind operates like it happened to someone else, then there's acknowledgment but minimising, dismissing, then finally full comprehension.
It takes time, most of all you need safety, so whatever triggers the overwhelming stress isnt directly re-experienced, and the sometimes powerful associations which can trigger involuntary memories, a film, a sound, a smell, anything, can be handled well enough.
I'd say dont rush yourself. The only time I experienced real bad trauma I was in a mess, I dont think I properly recovered from that, its just there in my mind and its unpleasant. I do operate more in the present and count the blesses instead of thinking of the past and future than I did previously. Got guilt too. A lot of the time I dont think about it, think of other things altogether. I never tried anything to overcome the trauma. I think that would be self-defeating and for a while I obeyed my instincts but didnt so anything I thought would result in addictive behaviour or dependencies or bad habits or greater guilt.