I haven’t gone through this however I’ve had doctors and family tell me I was a hypochondriac. That was until I got diagnosed with some crazy rare disease. Anywayssss, mostly good ways to avoid overthinking though is to redirect yourself, have a way to take your mind off of the bad thoughts. I believe (don’t quote me on this) that this could be a legit form of anxiety, as in medicine and therapy could definitely help you. I have spent a lot of time trying to not overthink my disease and I can get obsessed over it easily so in a way it’s similar for sure. There are ways to treat things like this and you aren’t alone just remember that! Hugs!!!