Is it possible to "invent" a "bad" identity?

Hello everyone.

I'm new here, so I am not sure about the right category to post this. I "sort of" have issues with my personality which are (I think) connected to dissociation and I want to ask a question.
I've been diagnosed OCD and had an accute psychotic attack about three months ago. I definetly had obsessive-compulsive thinking about doubting my sexuality, which has been so destructive to me that it led to the psychosis. In that state of being totaly stressed out, feeling like the worst scum of the Earth (it was THAT kind of sexual deviation that bothered me) I was imagining stuff -- sort of shock terapy I guess. Only I wasn't ready for that yet, so it was pretty much a big mistake and only made things worse.
This is where one event took place. While trying to think the way a "bad person" would think in order to persuade myself that I am NOT a bad person at all (and similar "mental simulations" -- I admit, not the wisest strategy) I suddenly realized that for an instant, a REALLY disturbing thought had formed in my mind sort of automaticaly, with the (I guess) real intention to hurt someone existing. So I was suddenly out of the simulation and in the real world with no clue of how it happened to me.
So my question would be: could it be that while mentally "role-playing" a bad character in the totaly freaked out state I was in one could really BECOME a bad character? Or FORM a bad identity, which could then live in one's head the way dissociated identities do? Waiting for the right moment to surface... You get the idea behind my anxiety.
It has been all over my head for about two months and I am really tired from it, but unsure how to make it go away. There have been no further signs of anything unusual, just the fear and anxiety, that it COULD be that worse-case-scenario-way. I'm soon starting CBT, not sure, whether will help...

Thank you for redirecting and/or answering me!