I really don't think you are going to resolve your fatigue problems with the approach your current doctor is taking. Your doctor reacts to TSH level and lowered your synthroid, and of course the T3 and T4 will also go down and symptoms will worsen. The reason for reacting to your TSH level is fear of you becoming hyper t. Yet, your T3 and T4 are still below average. If you have to stay with this doctor, I would insist that he/she run a parathyroid hormone test (PTH) to see if the low TSH is causing any concern there. If not, why be concerned with the TSH level? Your low temp. and other symptoms might also be related to other issues, such as low in vitamin B, or low adrenal function. All of these, and probably more that I don't even know about, should be checked out by your doctor.