I am new to this as well. From what I have researched and read here, it sounds like you might have
Graves Disease. Research it on the net. When you go for your test, be sure to have a full panel thyroid screen checking especiall for TSI (antibodies for Graves), TSH, Free T4 & Free T3. Like I said, I am new here but I feel pretty sure that others here will say the same thing or close to it. I hope you get the answers you are looking for.