I had a multinodular goitre but did not have antibodies for Hashimotos.
However, although being diagnosed with coeliac disease as a baby, I ate gluten from age 5 - 20. At 20, I became unwell and an endoscopy proved that my coeliac disease was damaging my stomach.
With recent changes in my medicine, giving me both hyper and hypo sensations, I am aware that the sensations are not unfamiliar from those experienced around and before that time.
After I came off gluten, I was quite strict about my diet and I wonder if that would have caused an absence in antibodies but the nodules may have produced at this time. Is that a possible cause as I don't feel my diet was deficient in iodine.