Good information, Mark. I just want to add that at 8 months out from chemo/rad I had a sudden and sharp decrease in energy (went from running to walking) but thyroid tests all showed up weird. Endocrinolgist said chemo was still affecting the results -- even after all that time, which surprised me. I will have more tests in a couple of months, and until then just walk very fast. I read somewhere that at least 50% of people who receive head and neck radiation will develop hypothyroidism. Add to that the fact that at least 50% of all women will do the same, and I figure I will be on drugs by the end of the year (grin). I, and perhaps others, will be interested to know how easy it is or isn't to get the dosage right for you.
Joanna