Hi,
Unfortunately I do not have an answer for you, only some suggestions. Did you try to take any vitamins, like the Bs, vitamin C, multi?
I use to take Levothyroxine before, that's mostly T4, then I switched to Armour, that's mostly T3, now I take a combination of 75mcg of Synthroid and 60mcg or Armour and so far so good. Maybe a combination of the two can help you. You should ask the doctor.