I have been having a constant throbbing pain in my left shoulder and upper arm for at least 5 months. It almost feels like a toothache in my arm and shoulder. Should I be concerned? I feel it mostly when I am relaxed on my recliner or when I lay on my bed. I do take sleeve or ibuprofen when it gets too uncomfortable. What should I do. I am 51 years old and I haven t had a medical doctor since grade school believe or not. I do work on making a lot of earrings at night and I do lift tables and a tent into my truck s bed so I don t know if I pulled a muscle or my posture is not straight enough when I work on making earrings for hours at a time. Need help please.