So if you have a formal diagnosis of OCD then hopefully you’ll have some appropriate professional support in place? Are you under a psychiatrist? What’s your management plan?
If you don’t have a formal diagnosis but you’re suspicious that you might have OCD then you need to speak to your GP about the problems and ask them for a referral to psychiatry for assessment. You could also try self-referring to an IAPT service local to you but if you have that formal OCD diagnosis then they might not be able to see you, but worth trying.
Check in with yourself and make sure that you’re engaging with all of the soft interventions/lifestyle factors that would help you to feel better; good sleep hygiene, healthy diet, avoiding caffeine/stimulants, plenty of exercise and very good, strong boundaries with those people around you who might contribute to your worries. My dad acts only out of love for me, but he’s also a very anxious person and is constantly ruminating on things, asking me questions or reminding me about things that I might already be trying to work through myself. Eg. I decide to just get a quote for new downstairs windows - he’ll say “oh good idea”, but before the man has even come to measure up my dad will be asking me about the most minute choices on the style of the windows, which way they’ll open, whether the frame will be foiled or smooth, which ones need to be an escape for fire safety, whether i’m having the UPVC window sills, etc. Sometimes I just have to tell him “that’s enough for now, I can’t make all these decisions now, I’ll wait for the quote”.
You could also get yourself a notebook and make a point of writing down the worry, and try giving yourself permission not to think about it for a while, or hashing it out on paper - all the threads of the worry and worst/best case scenario, you can’t forget it because you’ve written it down, but maybe right in that moment isn’t the best moment to examine it all either.
Sometimes when my brain is very busy with worries and stress and I feel physically very anxious I will get my notebook and write down all the things that are currently in my brain and contributing to my anxiety. Sometimes it helps to just give them a name, acknowledge them on paper and then write myself a few lines about what I can do about them.
I’m no expert and some of these things (the paper exercises) might not be appropriate for a person formally diagnosed with OCD, but they help me as someone very anxious with a formal diagnosis of severe combined ADHD.
Are you ruminating on problems that are current and do need to be solved? Or more a case of rehashing past events trying to make sense of them?
Good luck OP.