Lybrate-userji, Thanks for the query.
It is difficult to give any opinion by just reading your information. There is need to examine the throat, particularly the area where thyroid gland is situated, below the cricoid cartilage. It would have been better if you had mentioned the test results. Another thing if if you feel the portion of the neck has become a bit big, better to get it checked form a physician. Also please get ani TPO antibodies