Maybe your body needs a little more time…three weeks is a short period of time…the dr sounds right to stop the meds….esp with hyper symptoms.
there is a slight poss that the gland left even a small piece—because you know that it is surg imposs. to get it all may still have active graves……
i think he wants the scan to see what the uptake of iodine is to see if it is still overactive……..i did not have surg…so maybe someone else can tell you the normal time that you have to wait to see an adustment….
but follow the drs orders for now….he sounds like he knows what he is doing…..