I have been fortunate enough to find an endo to prescribe T3 to add to my T4. He also allows me to adjust my own T4 according to my symptoms. This has been working well for about 18 months. Then some of my stranger hypo symptoms started to creep back. Joint pains, carpal tunnel, depression and sore eyes began to really bother me. No problem, I thought, simply increase the T4 by 25 mcg. Well this was super efficient in reducing the symptoms but I started getting palps in the evenings. I dont think its the T3 unless the 20 mcg I take with my 100 mcg levo could do with increasing instead.