My dear, get your doctor to do an MRI with and without contrast material. An X-ray doesn't show the soft tissue, and the discs are soft tissue. You need to see if the discs are herniated, and it sure sounds like it. You MIGHT have a condition known as CAUDA EQUINA syndrome, and that can be serious. If you should lose control of your bowels, get to the EMERGENCY room! Then it would be a case of surgery!
After you get the MRI done, you need a referral to a NEUROSURGEON for an opinion. You may or may not need surgery. Right now, your bladder sounds like it's effected, and that's not good! See your doctor ASAP and make SURE he runs the MRI. If he won't do it, change doctors!!! But you need this done. PLEASE let us (me) know what happens, will you? I'm worried about you. I don't mean to scare you by any means, as this is certainly correctable. You may just need therapy, but the fact that your bladder is involved concerns me.
So take care of this ASAP. God bless and please take care. Hugs, Lee