Two suggestions may work for your case:
1)Many minor thyroid swellings are not visible on the neck if the head in normal position and more prominent during swallowing. Therefore do the "Thyroid neck check "self test.
2)In some cases, the thyroid becomes particularly inflamed, known as a thyroiditis attack. Dr. Steven Langer, author of the book Solved: The Riddle of Illness, refers to thyroiditis as like an "arthritis of the thyroid." He explains that just as arthritis attacks the joints with pain and inflammation, thyroiditis can mean pain and inflammation in the thyroid for some sufferers. And in particular, during a thyroiditis attack, common symptoms are anxiety, panic attacks, heart palpitations, swelling in the thyroid area and problems swallowing. Dr. Langer suggests taking some calcium/magnesium, which are nutrients that have a sedative effect, along with a pain reliever to relieve inflammation -- buffered aspirin or ibuprofen He's found that this helps about two-thirds of his patients suffering from nighttime thyroiditis symptoms. Reducing swelling is a key aspect of dealing with thyroiditis attacks, according to Dr. Langer. "Just as with arthritis, an anti-inflammatory pain reliever doesn't cure the problem, but it temporarily ameliorates the symptoms."
Hope that helps.