What Causes A Constant Pain In Head, Neck And Shoulders?

about a week ago I went to the doctor because my head was hurting. It felt like I had hit my head, only it was a constant thing. I had pain going down my neck and shoulders and was nauseated. He gave me pain pills, and muscle relaxers. They help, but when I don't take them, my head and neck and shoulders still hurt. Lately I have been getting a bad taste in my mouth, I feel dizzy, and right now it feels like my shoulders and my neck are becoming paralyzed. What do you think it is?