How do i deal with my boyfriend being gone? Help from wives/girlfriends in the same situation.?

My boyfriend has been gone for 2 and a half weeks in basic training at ft. benning in georgia. I'm having a really hard time dealing with it so far. I don't act all upset and weak in front of family or friends but behind closed doors, I'm a mess most of the time. This past week, I can barely sleep or eat and I can't focus on anything at all for very long at all. My thoughts keep wandering to him. I really need to figure out how to relax and be better while he is away. I need to sleep and eat and stuff but for some reason I just can't. Can someone in the same situation (a woman with a husband or boyfriend in the military preferably) help me out and give me some advice on how to deal with him being gone and how to not be so stressed out and be able to sleep and eat? Please and thank you :) i would really appreciate some adivce.