Yep, right there with you. I'm doing lots of work on this at the moment with my therapist, and it can get better. Leaning into it and trying to not be bothered by it are really helping, even though it sounds like the last thing you'd want to do with it. Also, I use the 'good enough/best guess' approach - my OCD wants 100% certainty that everything is real, but that's not possible. So I have to say to myself - 'right, I'm calling it - I'm about 70% sure that I'm real, and I'm carrying on with my day because I'll never know for certain'. Some days it's easier than others, but you're being really brave - hang in there.