Dear user 
Thank you for asking on HCM.
Iam saying on you that Yes  its tru :to have thyroid problems as result of a virus.
Can you tell me please: You are  diagnosis with hypothyroid 10 years ago. and treatment for it?
You are saying that 1 year later from ..?
When you beginning to treat thyroid problems with Synthroid?
Under treatment your 
TSH level consider borderline?
Dear Sir :,common. symptoms of 
subacute thyroiditis include 
fatigue, wekness and fever.
Did you have that?
Allso Thyroiditis refers to the inflammation of the thyroid.
Specifically , the 
blood test will measure your thyroid hormone:Ft4 and TSH (when one level is hight the other level is low)
Let me know please  did you have that time viral infection upper in the respiratoty tract?
•     In case  subacute thyroiditis or thyroiditis to reduce the pain and to control the inflammatory you must to take 
aspirin , ibuprofen(
steroid)
In my opinion you must to conslout with your endocrinolog with your last bloot test to thyroid hormone.
-TSH
-Ft4 
-Thyroid ultrasound
The symptoms usually go away within 12 to 18 months.
 In some cases, however, 
hypothyroidism may end up being permanent.
Hope that I have answered your questation If you have any futher questions I will be happy to help
Kind regards