text: Did you feel any cramping at all? Sometimes this can happen from cramping, otherwise Spasticity (muscle spasms) tends to affects larger areas of the body - arm, leg, trunk, neck.. Which is what it sounds like you had/have.\nHere is a little information on muscle spasms in this is the case. \nhttp://www.alsa-or.org/treatment/MuscleSpasms.htm\n\nAs for what Fuschiahedgehog said above\nThat is just absurd to say "Could be anything from a seizure to a stroke" who seems to think they are a doctor.\nRidiculous!\nHere are the signs of a stroke to better educate yourself... I can almost see "Seizure" because epilepsy causes muscle spasms/seizures which can cause an arm to shake out of control, but usually there are more signs of a seizure than just that:\nhttp://www.americanheart.org/presenter.jhtml?identifier=4742\n\n\nAnyways, you are better off seeing a doctor other than reading what others have to say who have no medical background.\n\nEdit:\nFrom reading all of your questions I would strongly suggest you see a doctor right away... Fever and involuntary jerking/shaking can be a danger and something has to be causing it. If Insurance is a problem, there should be some form of clinic near you that can work with you.. Also an ER in a hospital can't turn you away and won't charge you on the spot.. usually they will work out some sort of payment plan as well.