Thyroid condition/cancer?

In April I had a general viral infection that attacked my thyroid and made it go crazy. Supposedly, by my blood-work, my thyroid is better. There was a chance that I could lean towards hypothyroidism, but the test was negative for it. However, I still show some symptoms of a thyroid problem. Fatigue, neck pain, insomnia, dry skin, irregular period etc. Could I still have a problem that didn’t show up on the blood work? Or rather, if I had thyroid cancer, would my blood work show it?

Also, I have just started college, so I am under stress, but I have been more directly stressed out many times in my life and never had this many problems.

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