Some members have reported having to take mega doses to get their levels up
. I, personally, take 2000 iu/day, but with
low levels, you might be able to take more for a period, then retest.
You also have some symptoms of vitamin B12 deficiency (numbness/pins/needles in hands/feet, fatigue, etc), so you should get that checked, as well. B12 deficiency, added to thyroid disorder can be debilitating; I know, I've been there.