Fallen, I know what it's like to fall off. I just want to tell you what can help you out on getting back in there:
Foods to consider:
Progresso(or any) fat free soups(they fill you up. Just check the label for sodium content)
Any "lean" frozen foods
Slimfast meal shakes, meal bars
frozen veggie blends(they come in huge bags so you can just steam a cup or 2 every day-very low in calories)
chicken breast, real or cold cuts
water
And to start exercising again, maybe walk for 20 minutes, 3 days a week until you can take it up to 45 min or an hour. Me personally, I walk 30 min., 3 days a week, and don't plan to go any higher, so that I can maintain this, and if i lower after i reach my goal, my body won't go into shock and gain it all back in 2 weeks!
That's just my two cents! Way to go on getting back in the game, and good luck chickie!