False memory ocd, how do I deal?

Hello everyone I need some advice. I’ve struggled with what I think and hope is ocd for a long time. It started when I was 14 I had a concussion and my brain convinced myself for 9 months that I had this concussion. Then I had a gf at 15 before we were official I did a terrible thing im regretful of it for sure. I kissed another girl. I told my now ex girlfriend about it and I started to overthink the situation and think maybe I slept with the girl or maybe we did more than kiss. In reality we didn’t. when I turned 16 I started having thoughts of maybe I cheated on her with other girls at our school. It would be false memories of me sleeping or doing things with 4 or 5 other girls. That eventually went away as I would ask reassurance like a crazy person. Then one day what I believe was either Christmas time or new years around that time I had this thought “what if I SA’d my ex little sister?” This thought tormented me for so long I couldn’t believe it. As she was so young it would be impossible for me to do that without someone noticing plus that’s absolutely horrifying and disgusting and I’ve never ever ever ever been alone with her or desired to. Then what I knew would happen came along with me thinking I SA’d my little sister or my baby brother at the time. It was a horrible experience. Then it went to me thinking I was a pedo without the false memories. Then it went to my other siblings thinking I did something to them in their sleep, I did something to the pets, etc. As I got older I realized what ocd was and what I was going through and it eventually all went away. But as time goes on I’m now almost 24 I have spiraled back into thinking I SA my ex little sister. It’s crazy because I’ve never had that desire or anything at all it would absolutely break me if that was true. With something like this saying maybe not maybe it did is crazy because it’s a serious thing. I’m getting therapy on Monday and am just wanting my life back. I just recently got engaged to my beautiful fiancé and I want to be regular again. Anyone have any advice or even have gone through the same scenarios? It’s just so tough.

How can I deal with False Memory OCD? I am struggling with ruminating thoughts, and trying to figure out false memories! How can I enjoy my day without figuring it out?

I am diagnosed with OCD, ADHD, and mild depression. But my OCD symptoms are so prominent in my daily life where it feels debilitating. It comes in waves, there will be months with very minor symptoms and other times where it comes in random hitting me like a truck making me rethink life. I grew up having intrusive thoughts of all types, and a lot of them sent me over the edge because I couldn’t understand why things of such sort would cross my mind, things that I’m sure to this day that I’m incapable of or would never want to actually do. Yet I find myself in a constant cycle of trying to dig deep in the past and trying to figure out if I ever acted on any of the intrusive thoughts I can remember, yet ofc have no recollection of acting on them because they most likely didn’t happen. However, not having concrete proof of these things makes me not want to see another day sometimes. It is so hard to move into daily basis like this. I’m also in a happy healthy relationship and sometimes I get these thoughts of “what if I’ve done something awful during the relationship (for example, cheat, dishonesty, etc.) and can’t remember?” I know I would never do anything intentionally to harm my relationship and I think that maybe the idea of not having my partner sends me down a rabbit hole to think all these things. This mental fight is getting harder and harder. It feels unbearable. Does anyone have some fruit for thought, relate, or have any tips?