My Name Is Kay And I Am 69. The Last

My name is Kay and I am 69. The last 3 weeks my left arm as been aching from hand to top of shoulder. Pain comes and goes. Pain is aching..somtimes stabbing and today three times numbing and heavy feeling. Fifteen yrs ago I had cancer (byladeral) and limphnodes removed in that arm..could it just be from that? I do wear a compression sleeve only if I fly. Thank you Kay