Re: what next??
So sorry that you have to go through testing but it is always in your best interest, considering there is family history, to get tested. I know it is kind of scary b/c you don't know what the results will be but it is good to rule out anything that could cause the tremors.
Tremors are also caused by being too hyper. Have you been tested for FT3, FT4, and TSH lately?
I hope that the tremors are caused by the hyper and not by anything else b/c hyper is relatively easy to treat.