I've had hypo. since early 50s. For 20 years I took Armour and it worked great. A couple years ago doc switched me to Levothyroxine as TSH was up and down. Last Fall I began to suffer from severe muscle aches and weakness in upper arms, hips and upper legs. Doc prescribed Celebrex. When I lay off the meds aching extends down arms into wrists and hands now and can move up into left jaw. Last blood work after switch to 75mcg levo. and 1/2 25mcg lyothyronine showed TSH=.54, Micro. TPO antibody=10, Thyro. antibody=20. Vit D=52, B12=486, Folate=20. Prescription was changed from 100 mcg levo. due to last blood work showed TSH=2.17, T3 total=68, T3 rev.=29, Thyroxine=10.3. I am so tired and ache all the time. New Endo said no Hoshi but I read it can take years for antibodies to show up in blood.