Have very severe back condition, when I injured myself I crushed 4 disc in my back and 1 disc in my neck. I have never quit having pains, then there was the car accident that hit on my left side pushing my spine to the right, causing even more pains. I am disaled from it and have never had a day without pain since 2001. Anyway I just wanted to say I had, and sometimes have pain so bad it makes me sick to my stomach. And your problems sound like it might also be discs. They can only see the disc with mri or ct scan they cannot see them with xray.
I still have everyday burning and pain when sitting. From the disc located in the bottom of my spine. That is where the sick to stomach feeling comes from I think.
Get in to see dr if the pains dont quit soon. At most a spinal injury only suppose to last 6 weeks if no surgery ot treatment is needed. And at that they still might want to do some therapy for you. Cuz when you hurt yourself like that it could be the bones, discs and all the muscles and ligaments are also involved. I remember right after the car accident they put me in tape. And it helped the muscles too loosen up right away.

Good luck--seek medical help right away or they treat you like it's no big deal if you don't.