what is the pain in your arm like? Burning, throbbing, sharp? Does it hurt worse when you lift something or move your wrist? There may be many causes from something relatively simple to life threatening. If you have not seen a gp already for some reason, give us a bit more info on what type of pain you are feeling, and we will try to list some possibilities for your consideration. Sorry, I don't do facebook but will read your answers on the site where you listed your question.