Marble, I'm so happy you have an appointment scheduled, though I know it's hard to wait. At least it only takes a day or so to get test results. So I hope you get your answers ASAP!
As to what meds work, there's really only synthetic thyroid hormone, such as Levoxyl and Synthroid, and natural thyroid hormone, like Armour Thyroid, which is dessicated pig thyroid. You'll read about the pros and cons of natural versus synthetic, but I think the majority of people do just fine with the synthetic supplement (it's what I take).
If you test hypo, your doctor will probably start you on a low dose of Synthroid or Levoxyl and check your TSH levels every six weeks until you're properly regulated. Unfortunately, feeling better doesn't happen overnight, so you have to be patient and know that things will get better.
One off the wall question -- you say you work out 4 - 6 days a week -- is there any chance you could be overtraining and that your body needs a break? Overtraining can cause some of those same symptoms that you're describing. Just a thought.
