Hi Debbie,
The medications that usually carry side effects like weight gain and supressed sexual drive are Tricyclic Anti Depressants. You can read more about that here. Those medicines include Tofranil, Janimine, Adapin, Sinequan, and Anafranil.
The best thing to do is discuss this with your doctor so together you can determine what the best course of action is for you. Online resources are great to get the information you need to help you make informative decisions, but nothing takes the place of your doctor's solid medical advice and care.
Take care and stay in touch!Vicki M