I had Hashimoto hypothyroid for about 7 year. It was hell! I had mood swings, gained a bunch of weight and the worst...winter and cold weather. I had my neck fused in June of last year, they went in from the front, I think they pissed my thyroid off because it really started acting up after. It felt as if I had a jell cap stuck in my throat and someone pressing their thumb there as well.
They removed my thyroid in November and things have gotten better. Still battling the correct level for my synthroid, but that will happen soon.
Keep working with your doctor, hope all comes out well