Real Event OCD v. False Memory

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!

Without trying to seek reassurance, I’m wondering if anyone has insight on identifying an intrusive thought vs reality. Something that’s always really helped ground me in moments of false memory ocd is clearly remembering the exact moment the thought arose and how it started as “what if I cheated and don’t remember.” Then the images come and are extremely distressing, but I’ve always found some comfort in coming back to that moment of “this started as what if.” It feels like my brain is almost getting more creative with the thoughts now, and I’ve been having probably the worst anxiety of my life the past couple months after another intrusive thought entered my mind. I woke up after a night drinking and thought to myself “did you kiss your friend and don’t remember?” (Didn’t happen, undeniably proved). The rest of the day I stayed anxious about other things I could have done and poured over all my memories of the night. Then the next day I finally had found some peace based on all the evidence from my friends who were with me that nothing bad happened. I then thought “what about when you went to the bathroom,” which I hadn’t really been thinking about before, and then my mind immediately started flashing with images of me performing sex acts in the bathroom with some person who has no name, face, details, or anything I remember about interacting with them. I think I’m just concerned that this was a moment of genuine memory recall since I hadn’t been thinking about the bathroom before, and it was more of a sudden flash of images and “did you do that” vs “what if you did that.” I’m wondering how others are able to identify that something is an intrusive thought vs reality.

How do you know the difference :( I genuinely cannot keep living in this torment. it all started with an ‘intrusive thought’ where I had like a hazy flash of something reading an article. and I remember thinking ‘what if’ and ‘what is this’ and then that intrusive thought turned into me ‘remembering’ something else. which caused me panic. then I started trying to find evidence because it contradicted what I remembered this entire time. this was last year in like september. fast forward to march this year, it came back up- but this time stronger and with more ‘details’ and what nots. and I’ve been ruminating on it since then trying to remember and connect and It’s like I’ve added all of these details. but are they real? or is this just my OCD? I just feel like if it were real I would have never been able to keep it to myself. but also what if it was so traumatic that I blocked it out? because it all makes NO sense for me to do something like that. but it also fits what I was thinking at the time. idk