Hi Ashley -
You're not psycho. I had a flashlight in my bathroom for a few weeks & checked my mouth daily the first few weeks after I could open my mouth. I finally realized there's a difference between being vigilance and paranoia - vigilance is healthy; paranoia made me feel awful.
It will be two years for me this month that I will be cancer free (optimism is good). I still worry about every bump, lump and spot, and if a change becomes worrisome, I'll get to my doctor pronto.
Good luck and hang in there. Fighting the fear gremlin takes a lot of self control, but it gets easier.
Marlene