I need serious help....?

I cannot stop thinking of blinking/ breathing/ and swallowing. I cannot stop thinking about the actual action of doing it. It's not like I "hate to" blink a certain amount of times, and I don't feel the need to control it, BUT I CANNOT GET MY MIND OFF OF IT. It's been about 3 years since this has begun. Sometimes I go through periods of relief, but other times, like now, I go unto the verge of suicide because I cannot think about anything besides BLINK BLINK BLINK BLINK BLINK. What can I do?