Writing is very therapeutic. Write poetry or keep a journal. When I was going through a difficult time, I went back to school and took a night class. It kept me busy and it kept my mind busy. Once, I took a bow tying class. It did not take me long to realize I would continue to buy bows for packages...I just did not have the knack for making pretty packages. Had a few laughs from my bows! The key is keeping your mind busy.
Cry, scream, hit something - I suggest drums or a punching bag. Vent any way you can (safely). Then when you're ready, talk to someone. If you don't have a friend, family member, teacher, therapist..... talk to your dog or cat, or just write your thoughts down. You need to express your feelings, vent, get it all out...... then move on.
I was deployed in Iraq back in 2004-2005 and I missed so many people family and friends and the best thing that kept my mind off of them was to stay busy and focus on the work I was doing there, all the fighting that is since that was my job in the Army Infantry.
Write to them in ajournal every day, that way they don't seem so far from you. Send a real actual paper letter at least once amonth and see if they can do the same, just holding that piece of paper with words a loved one wrote means so much more than an e-mail... Try to call once amonth at least just to hear their voice and smile, even cry alittle just to release the feelings. Go visit whenever you can, have them visit you. Try skyping if you can... And just realize that missing them will happen and try not to let the sadness of it take over your daily life. :-).