Hi dear user
I have gone through your question.
I can understand your concern.
The major cause of pain in the thyroid is
subacute thyroiditis.Thyroiditis refers to the inflammation of the thyroid.Individuals with this condition will also have symptoms of
hyperthyroidism and later develop symptoms of
hypothyroidism.Headache is a simptom of hypothyroidism.
In my opinion the inflammation of your thyroid gland can be the cause of your symptoms.
I suggets to consult an
endocrinologist in your area because you need to do the thyroid tests(TSH,free T3 and free T4)to see the thyroid function and a thyroid
ultrasound to see the thyroid structure. Other necessary tests for the diagnose are ERS,CRP,Serum thyroglobulin(TG) and antithyroperoxidase antibody(anti-TPO antibody).
After the test results your doctor will be able to reach your exact diagnose and to give the right treatement.
Hope I have answered your question. If you have any further questions I will be happy to .
Wish you good health.