How to GAIN weight?

Oh my mistake, well the only thing you can do is just eat larger servings. I'm sure you know that 3500 calories are worth a pound. All that your situation leads to is that you've been eating far less than your caloric requirements. Maybe you could switch to a different medication? You could try buying some weight gainers at www.bodybuilding.com or www.massnutrition.com those are two of the cheaper websites I've been to. Are you smoking bud lately? That might be your best bet; get some hella munchies and just smash on some food. It'll never let you down.