I have had OCD my whole life and was only diagnosed with it a few years ago alongside Depression and Anxiety.
I take medication for my anxiety which has been a godsend for me but it affects people differently.
My OCD doesn't seem to be as extreme as yourself but I do get intrusive thoughts mainly aimed at my family dying etc (to which I have compulsions to stop it happening, although I know it's stupid, I cannot take the risk)
Odd numbers are an issue for me although 15, 25 etc are fine weirdly. As with FM I do find that whenever I play FM if my team is playing I have to make sure the cursor is on the side where my team are Home or Away.
I also had therapy for my OCD and although I still get problems, I always use this in life, for example, if i do have triggers I know its just my OCD.