Therefore, the conversion factors usually are one grain of NDT med is equivalent to somewhere between 75 and 100 mcg of T4. So your doctor gave you too much
Armour.
One grain would have been closer to your T4 dose.
That said, it could well be that you ultimately need a larger dose than one grain to relieve hypo symptoms, but even if that is found correct, it would have been better to start with one grain and increase slowly, as needed.