Hi Pooks,
I gained a lot of weight nortriptaline (sp?). A lot meaning 70 pounds in three months! I kept it on for a while trying different anti-depressants and other psychotropic meds. Now I am taking a med for ADHD Strattera which helps my depression and my attention. I lost the weight on that med and with the biking. I too think that therapy has helped in addition to the meds and more exercise. I would definitely see a psychiatrist, although find one with whom you are comfortable. My experience has been mixed with some of them being as warm as an arctic freeze. Good luck with all of this. Depression is the pits, but there is help out there.
--Pata