Heart Break, anxiety. With some comfort.

I had a breakup with my long time (5 years) girl friend. We broke up 1.5 years back and didn't talk for whole of 1 year. This was sort of a routine for us and I thought we can get back whenever I want. When we finally started to talk again, I came to know she got a job in Gurgaon and just to be with her, I too got a job in Delhi. After coming to delhi I came to know that she had already moved on when we broke up 1.5 years back and I couldn't accept it. I go to gurgaon everyday after work just to get to see her & listen to her voice. She doesn't like this & she doesn't want to get back with me. I have been having discomfort in sleeping, I feel afraid of being alone, all day I cannot think about anything else but her & the good & bad memories we have. This sort of eats me from inside and everyday this is getting worse. I can't concentrate on my job or lead a proper carefree and healthy life. We finally agreed that we'll be friends & that has provided me with some comfort.