what could cause a sudden drop in potassium level in a normal, healthy 16 year old to cause stiffness in arms?

Question

shortness of breath, rapid beat of heart, temporary paralasis of arms and hands,was taking amoxicillian at the time for 'sore throat',all other tests, except blood tests, came back normal. Have not received blood test results yet. Blood sugar level was normal. physical excertion brought on the problem

Answer 1

two things, excessive fluid loss combined with lack of adequate dietary potassium.

Answer 2

http://health.groups.yahoo.com/group/TheOpenDoorForsupport/