Hi there! When I took antidepressants in the past, I gained weight, but luckily not a lot. I think the only reason why I only gained about 10 pounds was because 1) I was only on the antidepressants for less than half a year and 2) I was obsessive about only eating 1200 calories per day by drinking protein shakes so I WOULDN'T gain more weight. It wasn't good because I tried so hard and I couldn't lose those 10 pounds. Oh by the way, I was taking Cymbalta.
Eventually I felt so insecure about my weight (I had body image problems) that I went off the antidepressants. I wasn't happy! I lost the weight very easily with a healthy diet and exercise afterwards. Now I decided to go back on meds because my anxiety had been getting bad. It was starting to really affect my life and I didn't want to start messing up in my career from being so anxious. I talked to my doctor about my concern about weight gain, and she suggested Prozac, which she said many of her patients DON'T gain weight on it and some even lose weight on it. So far I've had great success with it! I feel happy and great and much calmer, and definitely have not gained weight. In fact, I eat kind of a lot some days! I also run quite often, so I know I'm an active person as well.
Definitely don't be afraid to bring this up with your doctor, as I did, because perhaps there is something they can do to help! Maybe there is something they can tweak so you don't have to have such a hard time. Meds can definitely make weight loss very challenging, even when you are doing everything right! Keep up the great work on Weight Watchers and congrats on your success so far