I would definitely talk to another doctor. Have you noticed anything else that seems off with your body? For instance, have you noted any changes in your menstrual cycle? Do you feel fatigued, bloated, moody? Do a physical and mental inventory and share that with your doctor. Also, keep a food journal for a couple of weeks to track your diet more specifically. I find it difficult to believe that you'd gain 40 pounds from sheer overeating in a year's time. I would insist on having a full blood and urine workup as a starting place.

In any event, I'm sorry you're dealing with this. I hope you figure something out soon,

Kate