After taking 75mcgs levo since 2011,(diagnosed with auto immune thyroiditis), I persuaded my endo to increase to 100mcg in March this year, as I felt sluggish and couldn't keep a normal weight. These symptoms went but I sill have lingering suggestions that my thyroid is not working - aching bones, joints (knees and hips mainly) and muscles, brittle nails, foggy brain and poor memory, low basal temperature (averages around 36.2 c). Recent bloods: TSH .1 (.3 - 5.5); Free T3 5.2 (0-7); Free T4 18.3 (11.5 - 22.7). Is there anything I could try to get rid of the symptoms? I tried increasing the levo but went into 'hyper' mode and felt awful.