I think you and mac have hammered out the simple love thing pretty well!
I'm trying to work out how to help you detach.... your physical reactions are a pretty good sign that you have a ways to go there. I think it would be really good for you to b ein control of your life, right now I feel like you are "letting" him control your emotions. That's not a healthy situation, whether you are in a good realationship or not. I'm kind of thinking that if this was the case before he left, it might have even been a part of the reason he left. Which makes it even better to try to fix it!
Why not spend some time thinking about all the good things about beepee. All the things that you can love about yourself. The things that show you that you are a worthwhile person, with or without him. Maybe we can work towards detachment by turning your focus back onto you.