Sounds like a pinched nerve. I recommend see an acupuncturist or a chiropractor. I have had similar pain in the past. Try a hot shower and a couple advil and seek out help. Avoid the hospital, they will run you up a high tab and give you drugs that will only mask the pain.
When you read a book, in the same position for hours, and then suddenly get up to ...say , see who's at the door or something...stiff and pulled muscle syndrome....
I experience pain on my chest. It happen randomly. It feels like sharp things being stab onto my chest. The more I breath, the more pain it would be
Your best friends stabbin you in the in back fool!