Military life & Motivation

Hello everyone!
I am struggling to lose my last 15lbs or so and make more muscle mass, i keep yo-yoing about and never really sticking to enough to keep my last bit of weight off but my boyfriend of 4 years leaving on Sunday for Phase One training to join the Royal Signals has thrown a spanner in the works. I am home alone in a new city in a fairly new (and anti-social!) job and away from my family. Right now i am struggling to sleep and eat properly - either too much or too little and this is only basic training!

How do you other military wags keep motivated? I'd like to lose my last few pounds and be fit/healthy/happy for when he finishes and we have a few days together but i feel like i'm drowning a little.