how to suppress appetite and slow rapid weight gain

I don’t eat much but continue to gain more weight. This all started after giving birth in 2010. My ob/gyn thinks it is pcos because I stopped having periods also. Have not had but one in the last 18 months. I am up to 208 and its getting worse. I cant exercise because I hurt all over and I cant take diet pills because they make me violently sick. Are there any ways to lose this weight or to stop gaining?