I have underactive thyroid and have been prescribed levothyroxine tablets. I have been on them for 2 years and I don't feel any different, I am still very achy, I am still losing a lot of hair and I have not lost any weight. I follow the GI diet which was recommended by my doctor and I go gym 4 to 5 times a week. I work really hard at trying to loose some weight and am very disappointed that I can't. I am on 100mcg and blood test say my thyroid levels are fine. Has any one else had the same issues and what would you recommend that I do?