When old injuries get a makeover

My right shoulder started, today, late in the afternoon, to wreak seven kinds of hellish pain upon me. It is growing steadily worse. I can now not type without pain, and lifting it higher than waist-height is almost out of the question. This is after a does of Voltarol/Voltaren/diclofenac gel on it. But it clearly originates too deep. I do know I tend to fall ill after an exam, but this is something quite new. I can see no trigger for it either, other than possibly sleeping on it weirdly during an afternoon nap? Updates will follow. Tomorrow I try iaido again. Have been away for the past few days to write big test in other city. I am going to try and find out if someone could spray some cortisone into it. It's about time anyway, damn it all.