False memory OCD

Yes, this is very common with OCD, especially when dealing with false memories. OCD has a way of creating doubt even after you’ve convinced yourself that the memory is false. It’s like you go over it, feel certain for a moment, and then that "what if" creeps back in, making you question everything again. This back-and-forth cycle is a classic OCD trap, where the need for certainty fuels the anxiety and keeps you stuck in a loop of doubt and re-analysis. The more you try to "solve" the memory or be 100% sure it didn’t happen, the more power the OCD gains. It’s the nature of OCD to feed on uncertainty, and the more you give in to the compulsion of replaying the memory, the worse it can get. One way to approach this is to recognize that you don’t need to be certain. It’s okay to live with some doubt, even if it feels uncomfortable at first. Practicing sitting with the uncertainty and resisting the urge to "solve" the false memory is a key part of breaking that cycle.

Yes it's a compulsion. You feel like you got your answer and then the doubt comes back. Do your best to leave it alone. Once you stop compulsions, your certainty will increase on its own over time.

Yes. I try to create systems for myself to prevent relying on my memory only. For example I have a security camera at my door and I take notes of important times on my phone, etc.