Posted 3/15/2013 7:49 PM (GMT 0)
It sounds like you got tests to rule out kidney problems, infection, and those things that might show up on an xray, but for back pain those tests aren't very conclusive.
Your best bet is to get an MRI and nerve testing (as SB mentioned), have you been to a physical therapist? And what about the chiropractic care, did you recieve any?
It could be a lot of things. The tingling suggests maybe a pinched or trapped nerve somewhere. Without more information it's hard to say what it might be.
What kind of back pain is it? Is it an ache? Is it sharp? shooting? burning? Are you having spasms?