Celexa and appetite

I have Bipolar Type II, since I was 12. I'm 52 now. Unmedicated I'm a Rapid Cycler with psychotic depression. I was diagnosed at age 40, after worse and worse symptoms. So I have been on meds since - many different "cocktails" some effective and some not so effective.
My doc added Celexa to the mix a few years ago. It seemed to work well for the depression part of the bipolar, but I had bad ringing in my ears and incredible cravings for carbs. I got used to the ringing, but was very frustrated with the appetite out of control - so guilty!
Then I went on Wellbutrin and it was fantastic. Weaned myself (slow decrease in dosage over a month or so) and my appetite returned to normal so I was very happy.
Those of you who are starting it - don't judge the immediate symptoms - it takes a few weeks for it to settle into your system and be effective.
Those of you who are quitting - do it slowly or you'll have bad symptoms. It's OK to break the pills in half.

I have been on Celexa for 4 months now. At first, I lost about 6-8lbs. But just a few weeks ago I began to put on weight fast. I noticed that my appetite was out of control. I was informed by my doctor that such a low dosage (20mg) wouldn't cause such a reaction. But unfortunately I have gained about 15lbs in a matter of 3-4 weeks. I exercise regularly, but find that I barely have the energy to get thought the workouts, and when I get home, all I want to do is eat. Does anybody know how to lose weight while being on Celexa?