Suggest Remedy For Pain In The Arm Pit

My husband has a pain in his arm pit that radiate half way down his upper arm. The pain is not constant more pulsating. He is 77 and has been on simvastatin for over a year. His last check up, one month ago, was good. Should he be seen by his doctor right away? Or wait until Monday. Today is Friday January 21, 2011 The pain started 6 months ago and has increased in intensity and frequency.