I get intrusive thoughts about things I’ve done ... things I wish I didn’t do and regret and the images keep reappearing telling me I’m a horrible person, I’ve always been a caring person towards others and guilt is something I deal with a lot to begin with, with ocd it just makes me feel worse

Getting Intrusive Thoughts About Things Done | Feeling Guilt And Regret 

I have this too. I have one painful memory of a mistake I made that replays in my head.

I have it too! My OCD will conjure up a memory from even 30 years ago.        (I’m 50). I used to wish my brain was an etch a sketch where I could shake out the memories of regret or embarrassment or guilt. 