I was going to suggest some kind of dissociation too. I still have bouts of derealization and depersonalization, but I used to blank stuff out, not know if I actually did something or just thought I did.
Either that or the people around you are jerks just messing with you. I dunno.
With some things you can try reality testing. Like with the hand washing, a reality check could be to smell your hands. Do they smell like soap, feel wet still, do you have a paper towel you used that is wet...things like that. Then you know. Other things like the running, maybe check your heart rate. Unless really physically fit, most people have an increase in heart rate after running. Check your pulse next time, or just put your hand on your heart. Check your breathing, is it faster than normal?
Anyway it goes, sorry you have to deal with this. It's no fun.