I know how you feel! When I'm in Canada I can control everything I eat, mainly because I don't buy junk food. But when I'm here with DF, there is so much junk food everywhere! I'm doing a little better this time, because for a couple of months I've been writing down everything I eat so that I know how many calories I need to take in to lose a pound a week. BUT! Stepping on the scale has got me perplexed so far! When I was home, I was 165 lb. I got here, weighted myself right away, 165 lb. A day later, I was 167 lb! I'm like what?!? THis is impossible! Yesterday, I step on the scale, I'm 168.6 lb! I'm freaking out by now, because I'm exercising every day, I'm not eating too bad, within my calorie budget most of the time. Today, 166.6 lb! I give up! I have no idea what's going on! HAHA
Anyway, what I found is that by writing down what you eat, you take responsibility for everything you put in your mouth, so it makes you want to be extra careful. My doctor told me that I should lose about 15 lb and that would make my cycles shorter and it will be much easier to get pregnant. So far I've lost 7 lb, but then this yo-yoing with the scale here has got me confused.
So, tell DH that you need his help with this and not to get too much junk food. Exercise is also good, it doesn't have to be anything too hard, walking once a day should do the trick. I go for a walk in the morning and evening, do some biking, Wii exercises. If you can get DH to help out, that would be best.
Good luck