I wish you luck in getting to the bottom of your issues, let us know how it goes.
I also have been tested numerous times for thyroid problems, the only test so far for me that has shown positive, is a Thyroglobulin Antibody test and all other tests have been fine, I still haven't been given a diagnosis of thyroid issues yet, but I also do suffer from Raynauds, Sjogrens, and UCTD.

DaisyMae