I m 20 years old , and I have hypothyroidism, ocd and epilepsy medication ....my weight is 72 and height 5 2 ....lately one day suddenly my hands started shivering and my head is aching along with palpitations ....at this point of time didn't have any thought which lead to my obsessive thinking ...I m quiet fine ......my thyroid dosage is 50mcg .....lately from 1 year I had this frequent urge to eat something sweet ......and on this particular day I have my breakfast ....in lunch I had two oranges and green tea . What could be the reason of this shivers and palpitations suddenly. ...?