Ok im 16 and having this horrible pain by my right shoulder blade.Its between my shoulder blade and spine.It feels like someones stabbing me and is worse when i lay down.Also i have a dull pain all up my back into my neck witch is really stiff Like i feel like i have to crack it.I have had a MRI and xray but both are negative.My doc sent me to physical therapy witch seems to be only making it worse..what else could this be..what do i do