I had a pain in my back about five years ago deep in my upper right back. I was told it could be a pinched nerve. The pain finnaly went away and my upper right back went numb. But now for about a week the pain has came back more severe and spreading across my back and starting to go to the back of my neck, what could cause this.
I think An MRI scan may be required for knowing the pathology of nerve impingement but before this you need to get examined by an orthopedist/ spine specialist.  Who may put you on anti-inflammatory/muscle relaxants and some hot fomentation etc. to give you symptomatic relief. Avoid forward bending and lifting weighty objects for a few days and lie on firm mattress for few days