Over the past couple years my back has tightened up like woah. I used to have a pretty flexible back. I also used to be a chronic back cracker. I could make music with my back every day and it felt great. However today I can barely twist at all as my range of motion is very limited. I am unable to crack my back at all now as I can barely rotate without pain and tight resistance. This is all definitely upper back related. I also sometimes get what I think are pinched nerve pains. Where I will get a unique ill or nauseous pain usually if I am sitting on a bus or chair for a bit also generated from my upper back. Laying on a flat hard surface usually helps the nauseous pain. Perhaps I need to strengthen my back or stretch it via yoga? Any ideas?