Hi Nancy! Good morning. I am Dr Shareef answering your query. Getting back to Marvelon might not solve your problem of gaining weight and feeling tired. If I were your doctor, I would advise you for a thyroid function test along with a serum lipid profile, a blood sugar, and a complete blood count followed by an ultrasound of the abdomen to see the state of your pelvic organs specially the ovaries. I would decide on starting any medications only after the investigations reports were ready. At the same time, I would advise you to go for a routine aerobic exercise programme depending on your medical fitness. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. Wishing you an early recovery. Dr Shareef.