Bex

rapid heartbeat, especially when you stand up and move around, is classic low adrenals when they are struggling to cope, and taking the strain of keeping the metabolism going.

have a look at this

http://www.drrind.com/scorecardmatrix.asp

here you will see how it is possible to be very thin AND hypothyroid. Low adrenals hold the balance of symptoms in your case, but you can still be very hypothyroid. PLEASE PLEASE get this tested. These two things are most of your problems, and when treated can give you a major part of your life back. Yes, there is fiddling around with doses, but it's not that bad, and is certainly preferable to a slow road to total incapacitation. Please go to the doctor and get you Frees tested. Then read up on adrenal support - you will almost certainly need some before you can start taking thyroid hormone. If you don't you will crash your adrenals for sure. Read this:

http://f1.grp.yahoofs.com/v1/8AUQRU...Replacement%20Cortisone%20Therapy%29.htm

you can do these self-tests to check your adrenal function

http://f1.grp.yahoofs.com/v1/8AUQRf...20information/ADRENAL%20SELF%20TESTS.txt

Please take this forward, and let us know how you go.

Nicola