Lost 11 pounds without trying! Graves Disease!?

a few months ago i was diagnosed with hyperthyroidism (Graves Disease) i got the radio iodine pill for treatment about a month ago. these past few days ive had a CRAZY appetite and have eaten alot. at my last doctor appointment i weighed 125 give or take. lately ive been really tired, like wanting to sleep all day, i bruise easy, my body always hurts, im always feelin sick, im crazy pale even for me, and i now weigh 114. thats 11 pounds in a matter of a few days, even after eating so much and ot exercising. should i go to my doctor? what could it be?? Im a 15 year old female.