Welcome back!
I'm in the exact same situation as you and I recently just returned as well. The difference is that I gained 30 extra pounds!
It is sad, but you should definitely jump back in NOW. Think about it, at least you are 3 pounds down. 3 pounds is certainly better than nothing! You could start losing weight again or do nothing and possibly gain more (like myself). Then you will really kick yourself in the backside!
Mostly I wanted to say that I understand your frustration. I also love snacking in the evening and I'm a sucker for sweets like ice cream sundaes, cakes, cookies, etc.
You can still lose weight and allow yourself to have those items occasionally. I find that if I don't allow myself to "cheat", then one day I will have enough of dieting, go crazy, and eat everything I can get my hands on.
Therefore you shouldn't deprive yourself of things like that. Allow yourself to order fast food once a week and perhaps for dessert you could have a Little Debbie snack cake. It will be your cheat day.
I diet and exercise the whole week and on Friday my husband brings me out for an ice cream sundae with the whole works! I occasionally stop at Mcdonald's once a week as well.
It is about moderation. I know how easy it is to fall into the routine of reaching for a bag of chips or a cupcake while watching evening TV. Now you have to snack on healthy things and leave the junk food for special occasions.
It is hard at first, but you eventually adjust to it. Also it makes the times when you do have your special treat even better! After a week of no junk, an ice cream sundae tastes like absolute heaven!
Good luck