Life, did you lose the weight because of the depression or the rebound?
When people get past depression, or find a new motivation they did not have before, they frequently overcompensate before leveling out again. The key is to stay 'leveled out' and not slump back down again.
You haven't gained weight, you're still in the 'green'. Watch what you're eating and make sure to exercise EVERY DAY. You typically have to perform an activity daily or regularly for a cycle of 21 days before it becomes a habit...and we are absolutely creatures of habit.
A lot of people I talk to don't have a realistic concept of calories. I'm one of those people, actually. If you punch your numbers in to a piece of equipment that counts calories burned, you're burning a lot less than it feels like. I envision the twinkies just being incinerated in the furnace of my soul as I pound out miles on the exercise bike, but the reality is that I might be drenched in sweat before I burn off even one.
When you think you're done...do a little more. When your legs are exhausted, try to do push ups. (don't have a heart attack).
Roar and yell. Do not be conquered.
When you want the burger, eat a salad and chicken.
When you buy bread, don't buy white. The whiter the bread, the sooner you're dead.
Start with this as the point of mastery from which you will rule the circle around you. Be a sovereign over yourself and all that you do. Exercise is one of the simplest yet most effective ways to engrain this new attitude.