Don't worry, you'll be able to control your weight for sure. I just looked it up on the NHS website and there's not even one mention of weight gain! Just remember to stick to the exact course your doctor prescribed you and eat a balanced diet of fruits, veggies, protein (from meat/fish/soy beans) and a bit of fat (don't worry, it's essential for the body). And don't be afraid to discuss any issues or questions with your family or your doctor. A healthy mind is just as important as a healthy body.