it is not all about AMA or now called as anti TPO. u should also check out ur anti thyroglobulin
then again just bcos once AMA was negative it doesnot mean it cannot become positive later. it shows an autoimmune disease
presence or not. it can happen to anyone at anytime.
now u need to be on euthyrox
do a free T3, free T4 and then get back to me u can guide u through.
total t3 and T4 can be normal even if ur actual free or active t3 & t4 r low.
feel free to write to me on the details.