muscle stiffness all over pain including neck pain. it doesn't hurt when i breath. while sitting upper left side of back goes numb and tingly. it feels like it's cold. it hurts to shrug my shoulders and bend over. i had a baby 2 yrs ago and while i was pregnant the baby was sitting on my siatic nerve. most often i'v heard when a baby is sitting on a siatic nerve the pain is on the butt, but for me it was numbness then pain running down the side of my left leg. when i hold my child i can still get that pain and numbness although my chronic pain is mostly upper-back.