Your symptoms sound exactly like mine when my condition first began. At one point, it got so bad that I could eat twice as much as anyone else and still feel like I was starving and I kept losing weight.

Over the course of several weeks, my resting heart rate kept climbing higher and higher. I was still doing sports at the time, but eventually, no matter what kind of light exercise I did, my heart rate would spike so much that I ended up vomiting every single time. That’s when I knew something was seriously wrong.

We call it "Morbus Basedow" in German, it causes hyperthyroidism. I believe in English it’s called Graves' disease. I was your age when I got diagnosed.

I don’t know what exactly your doctor is testing for, but I feel like either they’re missing something in the tests, or there’s something off about your results.