I keep wanting to recheck and recheck the same thing over and over again even though I know now that it's all good ugh

Do yall ever reread old texts from a toxic ex and try and “solve” stuff constantly? We ended things 4 months ago and every day I go through old texts trying to prove I wasn’t the bad one, make SURE she was toxic, “solve” a random toxic moment I remember and make sure I have ALL the details remembered accurately and that I’m not misremembering it. It’s like im still living in the relationship. It’s draining and will not stop. Is this an OCD thing? How is it fixed?

I'm trying to not seek reassurance today. I'm not going to. I'm not going to. I'm NOT going to!! Ugh. Why OCD why?

This might be super specific, but something I struggle with is feeling the need to consistently look up things for reassurance. I feel the need to look up the same things over and over again just to make sure. Example: googling what to do in serious situations like a car crash, if someone’s having a heart attack, seizure, etc. I’m (soon to be) a healthcare professional and I feel like I know these things like the back of my hand. I feel like if I ever get to these (extremely unlikely) situations, I won’t know what to do. I feel the need to constantly reassure myself the proper protocol for situations that will probably NEVER happen. Anytime I think of this possibility, I can’t help but become trapped in a spiral of googling what to do. It’s come to a point that I’ve started noting down what to do over and over again if these situations happen. I really just want to know if anyone relates.