Sometimes I can't stop thinking about whether I locked my front door or not so I check it 3 or 4 times every time I go out.
Oh no, I think you have OCD :(
What is OCD and what do I need to do for it?
It  is a mental disorder where people feel the need to check things repeatedly
It drives me crazy.  What can I do about it?
The cause is unknown so I think just take good care of yourself and have someone that loves you nearby always
Do you think my diet has anything to do with the OCD?
Not at all, some of the symptoms and activities sufferes always are hand washing, counting of things, and checking to see if a door is locked.