I'm having some really serious shoulder pain...?

Ask your doctor if "Aleve" is right for you. Ask him/her also if you would benefit from soaking your body in a warm whirlpool bath once/twice a day would help. I do this myself at the local health club for tennis elbow problems and it seems to help me a great deal. Over time I pray that the problem you are having greatly improves and that you are going to be able to cope with your discomfort.