Armstrod:
I wonder whether the shock damaged your thyroid and thereby exposed previously sequestered thyroid antigens to your immune system, and triggering Hashimoto's autoimmune thyroiditis, or some other subtype of autoimmune thyroiditis. Hashimoto's classically has a hyperthyroid phase during which the gland is being destroyed and releasing excess thyroid hormone from the destroyed follicles. Then there's a euthyroid phase when the amount of hormone released roughly equals normal values because many of the follicles have been destroyed. Finally there's a hypothyroid phase where most of the gland has been destroyed by the immune response. I don't know whether that's what happened iin your case, but it seems possible.
I wonder whether the shock damaged your thyroid and thereby exposed previously sequestered thyroid antigens to your immune system, and triggering Hashimoto's autoimmune thyroiditis, or some other subtype of autoimmune thyroiditis. Hashimoto's classically has a hyperthyroid phase during which the gland is being destroyed and releasing excess thyroid hormone from the destroyed follicles. Then there's a euthyroid phase when the amount of hormone released roughly equals normal values because many of the follicles have been destroyed. Finally there's a hypothyroid phase where most of the gland has been destroyed by the immune response. I don't know whether that's what happened iin your case, but it seems possible.