I am a 35 yr old female, two pregnancy, suffering from hypothyroid for over 7 years (started with thyroiditis). Current tsh 0.13 (was 0.05 four weeks ago), t3 23.2, t4 14.0, free t4 1.22, t3 uptake 20.2, cortisol level 0.78 mcg/dl. My endo has me on 150 synthroid. I have contiually gained weight over the past year - year and a half. My endo put me on phentermine and despite the very low caloric intake (was not a big eater or snacker to begin with...don't think endo believed me - only been seeing him for about 9 months) I did not lose any weight...not even one pound. Was on phen for 4 weeks - I am no longer taking it. I am exahusted, weak, contiually fighting off some sort of cold or infection, usually sweaty and hotter than everyone else despite what tempurature might be outside, always have a low body tempurature. Had a body scan that indicated I barley had any thryoid tissue (I think non-issue as I am on a high level of t4 so I don't think it matters). Tested negative for Cushings, but did discover very low cortisol level??? Curious as to what causes low cortisol or if it is or is not a problem to worry about. Long story short...I am at a stand still with my endo. He is encouraging me to wait it out and hope that my body will adjust the t4/t3 conversion on its own as I have plenty of t4, and tsh is low??? What would you sugguest?