As others have mentioned, your problem is the meds.

The thing you need to understand about meds is that they go in and reset the weight set-point in the brain telling it to either gain or lose a certain amount of weight. It's similar to turning up the heat in your home--your furnace runs longer until the room is at the new temperature if you raised it, and shuts off sooner if you turned it down. Same with your weight set-point--you'll be hungrier and want to eat if the med raises your set-point until you gain up to the new weight. If it lowers your set-point, you won't be hungry and will drop weight until you're down to the new set-point. It's virtually impossible to lose the weight when the med has overridden you old weight set-point which is why you're dieting and exercising to no avail.

This is also one reason so many people are morbidly obese in our society today--they're on psych med that have made them gain a ton of weight.