I am hypo and have been doing several unsupervised fasts recently with positive results.
I've done anywhere from a week to 18 days. Lots of uncomfortable detox, but my head is starting to clear.
I had to cut my thyroid meds back during the fast as I went hyper. Hopefully a few more fasts and I can cut the meds all together.
You should also research Iodine on the curezone Iodine forums. You most likely are suffering from halide poisoning as I am. Bromide, Fluoride, and Chloride, in excess as is now the case in our modern society, with a decrease in the intake of Iodine is a toxic situation.