In 2002 I was very Hyperthyroid. Mine was due to a heart medicine I was on that had alot of iodine in it. I took meds for about 18 months and was weaned from them and am now fine. The TSH test is not the only test that should be run, you should also have tests for what I believe are T3 and T4. I am not positive on the tests name, but I would ask for a referral to a Endocrinologist and they will be better able to help you.
I was lucky that mine was just caused by a medication. I would have hated to have had Graves Disease (Hyperthroid) permanently too. Once on the thyroid medications it took about 4 weeks before my symptoms started get better. Hope that helps. Oh my symptoms were very much like the stomach flu, racing heartbeat, and an overall weakness. I remember I didn't sleep real well for awhile.