Getting over a relationship so I can sleep?

I had an on-again-off-again 2 and a half year relationship with a guy and I believe that we've finally given up on it. I don't exactly know what happened but we just stopped talking and I think we may have gotten over the struggle its been. I'm so used to having the on and off that I stopped letting myself feel as a defense I guess. I can't even evaluate what it was anymore because I'm afraid to admit to myself that I love him. Now, I kinda wish I could feel something so I could get over it. It's only been a few weeks but I cant even cry. I'm ok during the day because I work so much, but at night I find myself hardly sleeping. I'm not even consciously allowing myself to think about everything, but I know that's what's wrong. Any advice for dealing with this? I've tried writing things down to clear my head and so far it hasn't worked.