I often say that, in my opinion, the majority of thyroid patients have an underlying infectious cause for their illness.
Could you have mycoplasma ( a classic Lyme co-infection).
This lady believes treating her mycoplasma improved her thyroid issues
"The challenge was now to find a physician in the area that understood this root cause for autoimmune illness"
Like me, she treats underlying infections and treats their effects on the endocrine system. Thyroid in her case. Thyroid and adrenals in mine. Treating those infections has allowed me to halve my thyroid and adrenal meds.