Went to emergency with severe pain in right shoulder, up into the neck and down the right arm (woke up with it). Have been on 500 mg. Naproxen , twice daily, for 3 weeks, and 10 mg. Pms-cyclobenzaprine every 8 hours. I'm still experiencing pain plus some new tingling down the arm. Should I be going back to my doctor? It seems this is taking an unusually long time to get better.