Delusional memories?

I went to bed one night in November, and I can't quite say what happened, but I believed that I had a "memory" from childhood. I won't discuss what, but I had "remembered" doing something sickeningly awful. This thing came to me almost as clear as a real memory. I remember thinking something along the lines of 'How could I forget doing something like that?' followed by a feeling of complete horror and terror. I have moments of "clarity" where I can't believe that I'm questioning doing this thing, and it appears obvious that it's false. But now, I'm more than often believing that I did. I am spending 24/7 fighting my head, and it's taking me to dark places. I know this is the worst thing to do, but you don't understand, if this is real then I am a monster and I can't just adopt the 'maybe I did, maybe I didn't approach'. I just can't. I have to know. I'm so scared. My entire life is on the line. I don't have anyone to talk to about this. Literally no one. I feel like I'm insane, like I'm a monster, like I'm hiding my true identity from everyone I love. Does this sound like False Memory? Or am I in denial, trying to convince myself this didn't happen? Why does it feel so real? And why do I have moments of clarity? I also had my first nightmare about it last night. Please someone help me.

Is a false memory a type of intrusive thought?

im going to be vague here, but basically i did something in the past that i regret and it became a huge point of my OCD but i have talked to my therapist and i have mostly moved past it. i watched a video by an OCD youtuber that really put it into perspective. anyway, i have been with minimal worry for a few days, but now im having worries related to i think false memory? basically it’s like “oh but what if i said/ did this and just forgot that means i harmed this person im a bad person”. to me it sounds like textbook OCD but im just wondering if anyone else has experienced false memory / real event at the same time. i have a really horrible memory which is making it even more stressful. any responses are appreciated!