I just need a little help.

Im in Iraq in the US ARMY in support of Operation Iraqi Freedom and my girlfriend of 2 years left me right before i left and now she wont talk to me. Everything was on the up and up. We were'nt fighting or anything and she went from completley in love with me to not speaking to me and saying she doesnt have feelings for me anymore. So thats my main problem but some of my problems dont even stem from that i dont think. And everything seems to be going against me. Everything i try to do good ends up blowing up in my face. Literrally everytime. Nothing good has happened since this deployment kicked off. I have sometimes thought of suicide but i know it would break my family's hearts. And my brother is Bi-Polar and very sensitive about me being over here so i fear that if i do something to my self that he will too. And my mother just lost her baby so i fear that she might do the same. But if it wasnt for them and the amount of love i still have for my exgirlfriend i would have done it already. I love her so much and i guess i think that if i dont go home becuase i did something to myself i would never get to see her again. But everyday i wake up and it seems like i will never make it through the day. My heart drops like every 5 minutes and it feels like it falls through my feet and into the ground. And its so heavy that i can't pick it back up and i have to drag it around all day slowing me down. I get hungry but everytime i eat i just start to feel sick. Im down to just taking a few bites at meals. I can barely sleep half the time but when i do finally fall asleep and morning comes i dont want to get out of the bed because i know that i have to deal with everyone and i just try to stay away as best as i can but its the Army so you run into everyone eventually. I still have Cynthia's (my ex) picture in my wallet that she gave me just before i left for basic training and it says not to forget her on the back and that she was so thankful for getting to know me. But now it seems like she hates me. I think its because i did things to her i shouldnt have. I have pressured her into things i shouldnt have and made her sad like when i get jealous and when i yell in traffic. But i would give anything for another chance with her and i would never let her be sad again or pressure into things again. But it will probably never happen because everything has been going bad. Ill be lucky to come out of the desert without paying the Army a lot of money for my mess ups. I guess i just need advice on how to handle everything and keep from doing something bad. Or advice on if i should see a proffesional.