Hey it really sounds like you have a hard case of OCD. Have you talked to a therapist about the your obsessions. I talk to mine about them I could give a few tips that work for me. When the thought pops in your mind , don’t fight it that just makes it worse. Just casually focus your mind of something else, something funny, a good movie, anything else. This usually helps me I start obsessing over things because eventually it just floats away into the abyss out of my head. Also writing/journaling has helped with my obsessing also. Take a few minutes out of the day and write down what your obsessing about. It’ll help you release it from your mind. I hope those tips help!