in my advice, switch to the wrist and even to the fingers, cause you could easily develop tendinitis in the elbow. i am no doctor but i know that much. it may seem difficult to change your ways of playing, but in the long run it will be better. and besides if you are getting tired so easily, to the point where you need a rest, then you know you have got to be doing something wrong.

basically i would STRONGLY suggest changing your playing. if your sound suffers for a month or so, i think it would be worth it.

jesse sutton (canada kicks ass)