How do I stop ruminating about a past event and what parts are true or not? 😞😔

So hard to not engage the thoughts because even though it's from the "past" (i don't even know if im remembering things correctly and it kills me) and i can't change it, I just NEED to prove it to myself that it didn't happen this way. If you'd asked me questions maybe a few months ago, I would have been able to lucidly explain things. Now I just feel like I'm in a constant swarm of thoughts, not knowing if anything is real. If my brain is to be trusted. Wish I could just get hypnosis to forget

Hi all, I’m really grateful for all the support I’ve gotten from people in the last few days. My mental health is at an all time low and I really appreciate the relief people have brought. I had a question about whether an intrusive image of a potentially imagined event can feel just as real as a real memory. I’m doing my best to stop ruminating over an image I have in my head, and have gone so far as requested security footage of myself and have been told both through that and by my friends that nothing bad happened, but the image in my head feels just as real as other memories. I was also drinking the night in question, which makes it harder for me to dismiss the image and makes me feel like I shouldn’t. I was just wondering if imagined images can feel just as real? I’m trying to use tools to ignore the image, and have therapy scheduled for tomorrow, but I feel like I can’t responsibly dismiss the image even with the evidence I’ve gathered if there’s something about a real memory that looks different in the brain and that if so, that suggests my memory is real and I should confess it. I’m really working on stopping reassurance seeking as well, especially now that even after being told that nothing bad happened when the establishment I was at reviewed security footage, my brain is telling me “they’re probably just lying and never reviewed it.” I know I need to just stop ruminating, reassurance seeking, and mentally checking the memory, but I just don’t know if I can/should in case the image is what I should trust more, if that makes sense.

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