Hi Doctor, I had thyroidectomy 21 days before , I had grave disease before hyperthyroidism, my menstrual cycle was very short before the surgery (25 days exactly and always at time) , now it already 4 days late , is it common after thyroidectomy to experience that? also I am not sleeping well , I have to wake up 2 -3 times during the night , (disturbed sleep). in addition the mussels behind my neck some times are paining right after I wake up . thank you so much.