Maybe you should start seeing a therapist. I started having severe problems with body dysmorphia and OCD relating to my skin/acne last year. I was basically having panic attacks even over one small mark on my skin. I wouldn't eat, wouldn't leave my room, kept calling my family in tears and saying I wanted to leave school. It was a nightmare. I also did the "mirror check" thing all the time, where I'd constantly go to the mirror and 'check' my reflection to see if it was as bad as I imagined.
I started getting therapy and have been a lot better ever since. I recommend you do the same, and resist the urge to go to the mirror!