Help!...while my boyfriend and I are apart?

Okay here's the info. My boyfriend and I have been together for a year and a half...we met in college which is still where we are and when we're at school we're together a lot...we always have good times and a lot of fun. All in all its a very loving relationship.

Everything is fine except for my anxiety when we're apart (i.e. on holiday breaks, because he lives about 2 hours away from my house). I have a lot of anxiety, and I'm recently on medicine so I'm hoping it kicks in for winter break which is at the end of this week, but I'm still nervous.

Basically, I'm upset when he leaves me to go home because I miss him and also we have a history with issues with his friends. When he and I were first dating his friends from home were very very rude to me AND to him (they take advantage of him a lot) and they still are and it hurts to know he is going to go home and hang out with them. Don't get me wrong I trust him and I'm not worried he's gonna cheat on me or anything, I just don't know how to control my psycho girlfriend-ness when we're apart. I get to be that very crazy controlling girlfriend and I don't want to do that this time because I want him to have fun and I don't want to fight....

Any suggestions on how I can do this more easily? It's so hard for me...

Thanks in advance!