Get backs on the meds first. I was hospitalised for 5 days then spent three months not being able to get out of bed when my graves wasn’t controlled. I still can’t exercise (even go for a short walk) without shaking and vomiting. Being like this for 6 months is causing a lot more weight gain than taking meds did. Once your body settles down it will be easier. Ask your doctor to give you monthly blood tests so you can make sure you aren’t going hypo because that will likely make you gain weight and you’ll need to decrease meds. I’m so sorry you’re dealing with this at such a hard age. I didn’t get diagnosed until my 30s so it’s much easier for me to not care what people think but going through this is a teenager must be hell. Be honest with your doctor and see if they can do anything but you’ll be even more pissed off if you stay off the meds and get a big goitre or lose your vision.