Thanks for commenting. I did not have other thyroid tests done. They were done about a year ago and were normal. At least that is what I was told. I did not obtain a copy of the labs.
This is a puzzling combination of findings. Did you happen to have your free T3, T4, and TSH tested? An elevated TPO antibody result strongly suggests Hashimoto's thyroiditis, but does not measure thyroid function, which is what the free T3, T4, and TSH do.
ANA can be elevated in people with autoimmune hypothyroidism, though it is much more specific for lupus. I'd certainly seek another opinion.
Actually, I've had to do that a many times over many years, all of which ultimately led to a diagnosis of several interrelated problems mostly autoimmune. Good luck.