There are doctors who give thyroid medication in cases of CFS. Sometimes this can help, even if the lab tests are not technically below normal. Also, I think one woman here reported that she had a major heart attack because they ramped up the dose more quickly. I'm posting now to report my experience. The doctor put me on Nature-Throid and ramped it up slowly. This was done during a time when I had just crashed during cancer treatment. IOW, I felt much worse than usual. I was on Nature-Throid for 3 years. Because of a problem getting the prescription refilled, I ended up being off it for close to two weeks. And during that time I started being able to stand up longer. The doctor agreed I was having a bad reaction to it. Also important to note, by conservative standards my blood tests didn't show me as low on thyroid. Lesson learned. It's possible to end up on a medication that is making me worse, and not be aware of it. So now (where possible) I'm going to stop some others one at a time and see what happens. Not critical ones, though.