underactive thyroid
"I have had hypothyroidism for almost my entire life.  I have been on Synthroid and generic levothyroxine and never felt much better with all symptoms remaining.  I finally got an endocrinologist to listen to me and he lowered my dose of Synthroid and gave me liothyronine.  My depression lifted in 2 days, my cholesterol dropped 40 points and my energy level has never been this good.  I am having a little difficulty with insomnia.  I still struggle to lose even 1 pound but I'll still take the difference that I feel."