I need advice

I went out 2 years ago with some friends and I can’t remember some of the night - we went to a house party and my friends say nothing happened but I’m so afraid that I cheated on my partner and don’t remember it. It’s consuming my every minute and I can’t let it go. I was reading up on false memory ocd the other day and it triggered me into thinking what if something I imagined happening actually happened and I don’t know what to do and I’m scared that because I imagined something a certain way that if it wasn’t the same thing I imagined that it must be true

Just now, I was driving and I made it to a four-way stop and I made it to the stop and I thought it was my turn to go. I started to turn and this other car from my right started driving too and so I just kind of made a confused face because I was confused. He on the other hand, made a confuse face back at me like I was stupid and kept driving. After that without much thinking, I just turned to follow him and while I was driving behind him, I felt bad because I did not want him to think that I was actually after him. And then I kept on driving so he wouldn’t think I was trying to follow him, but it was in that moment where I just didn’t think and turned behind him. I was a little upset, but only because he made a face like I was dumb. Now I’m having thoughts of just thinking that I’m a stalker and I’m gonna follow him and hurt him when I know I was just a little upset, but didn’t wanna do anything. I promise you I legit just turned after him without much thinking and while following him felt the intrusive thoughts and stuff. Was made to fight even worse is that while waiting for food I had ordered over an app, I couldn’t fight the thought of just going back to where he turned off the street after I kept going to stop “following” him, so I went back down there on the spur of moment and making me feel bad again. I don’t wanna hurt anybody and I don’t want to stalk anybody. It was literally just an impulsive thing but now I feel scared about myself.

For context, I was previously diagnosed with GAD and OCD. Months ago, after a night of drinking with coworkers I experienced slight hangxiety, but I remembered most of the night. At work when I asked a coworker if I did anything weird he made a joke that really wasn’t funny. This joke caused me to doubt my memory. I think I had thought I was more sober than everyone else when in reality I was not. I remember checking on a coworker who was slumped over in the drivers seat of his car and in no state to drive and asking “you good?” The next thing I remember is that I was in the drivers seat of his car reversing out and I think I assumed that he and our other coworker were also in the car. Our other coworker stopped me and told me to pull back into the parking stall and come back inside. I remember the events both leading up to and after that all the way until I got home. However the small gap in my memory had been causing me a lot of distress, so I asked that coworker who I went to check on who was the only person that was present during the gap in my memory if I touched anyone or let anyone touch me, to which he said no definitely not. He also said that he wasn’t in the car when I was reversing out and that he vividly remembers that I was the only person in the car. When I explained to him that the joke that our other coworker said made me worry that I might’ve done something that constitutes cheating on my bf he said no that guy is just weird and says effed up stuff. I feel a lot better, because he has no reason to lie and he doesn’t seem like that type of person. However I still feel unsettled, so I plan to call my doctor’s office when they open in the next hour. I’m wondering if anyone has experienced anything similar/has any advice.