Two weeks ago I was doing upright rows and felt a sharp pain in my left shoulder. I stopped the workout and iced it. I did my back workout without any problem two days later. My next push day i couldn't do flat bench without any pain. However, I could do incline and shoulder press without any pain. I still have a dull ache that is pretty constant, and i can't do any lateral movemants without pain about halfway up. Any ideas?