lower back pain not muscle

Middle back pain, muscle aches and feels like the spine. What is this?
I ran a race that was 4.5 miles on Sunday and since the middle of the back has been in pain. its seems that the muscle, but the pain is so close to the spine, I'm not sure. it hurts when I move my back with lateral movement or when I take a deep breath. I tried to crack my back and only the lowest is cracked, the top doesn't move. than it hurts a week? What should I do? im training for a marathon. I already have the shoes very well and the extra support in my shoes. Plus my poor posture does help my pain back. What is this pain? my column or my muscle? I go get an x-ray, see a chiropractor or a massage theripist?
Probably adjust the insertion point of the ribs to the spine. I would like to see the chiropractor. Complete reorganization that thing can only solve the problem quickly. and ibuprofen.
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