Happymomma --
I can't even imagine how tough it is to be you right now, seriously. The idea of having bf (don't have a husband!) leaving for such an uncertain future would kill me -- I have unlimited admiration for your strength. It's completely understandable that you feel really vulnerable right now, and I wish I could offer you better advice!! The only thing I know is that I've found amazing support here, even for things that have nothing to do with weight loss. I have no doubt at all that it's going to be really really really really tough for you for a few days or weeks, but that it will progressively get a little easier. Not that it'll ever be the same as when he's home, but you'll adjust.
Today it might be best for you to be by yourself, but you should really try to get into contact with some people that can be a support system, even if they don't know that that's their purpose in your life. A friend, a family member, anyone to just keep you involved.
Once you've gotten over this first emotional hurdle, try and get back into the gym/workout routine. It really does help take your mind off things and aside from losing weight, it's just plain healthy. And just think of how proud of you your hubby will be when he hears that not only are you staying emotionally strong and keeping up with life, but you're also trying to take positive steps toward having a healthier life! Not to mention, having a kickin new body when he comes home would be an added bonus
My thoughts are with you...and all this business right now isn't weakness, this is your strength showing how far it can take you.