I am 72 years old, and have lost 20 to 25 lbs since the start of the year. I now am 6'0' at 123 lbs, with little but skin and bones remaining. tired all the time. Have been on Thyroid sup since fall of 2010, when it was discovered I had almost no thyroid function. My GP recently reduced the amount I take, but that has made no difference. I have had CT scans of both lungs and pelvis with nothing discovered.Before I evaporate--help!?