Yeah it was bad....started with just a virus ~ fever, sore throat, congestion, aches etc.
3 days into it the fever spiked, and over the course of a week my neck blew up like a football, was painful, and I lost 20 pounds!
I had ACUTE THYROIDITIS

But initally they feared it was cancer because my dad died at 38 from Hodgekins Lymhoma.
I couldn't sleep, it affected my heart (was tested for Congestive Heart Failure).......I saw the doc and lab every other day for weeks.
Over weeks and months, the thyroiditis causes it to be HYPER...then HYPO, and hopefully stabilizes (which mine did on it's own)
It took me 18 months to recover and finally was even able to get off the meds.
It was a flukey thing.... but could happen again they said if a virus is bad enough.
No fun...I feel for all who live with any thyroid condition!