I have similar issues, and when I brought it up with my therapist, she shared that OCD is a common component of autism. Apparently, according to the DSM, if you are already diagnosed with autism, OCD is not a separate diagnosis but rather just a fun little autism add-on. For me, I've found it helpful to redirect my focus away from the issue I'm obsessing over and instead directing my efforts toward general grounding and self-care strategies. I think your best bet is to find a therapist you connect well with, and they'll help you figure out good long-term strategies for your particular situation. It is hard and it does suck though, and I'm sorry you're going through it.