I highly suggest visiting a REPUTABLE chiropractor in your area. Make sure they take x-rays and EXPLAIN the results to you. In the meantime, try going to a chiropractic website and reviewing the info there. When you have an injury that pulls joints/muscles/vertebrae out of place it can pinch off nerves, cause extreme muscle tightness, affect circulation, etc... A course of chiropractic care might be just the thing you need to feel great again!!
Yeah, I had a similar situation. I have a bad back from a car wreck a long time ago. Well, I fell down in the driveway and wound up with an air cast for my foot. I limped for many months and it never healed right. Next thing I know, my lower back started hurting big-time and I had other wierd nerve type symptoms. I finally realized after consulting with a neurologist that, when I was limping all the time, it made my old back injury worse, because I was leaning to one side to compensate.
You can have a CAT scan done of your back, it's less costly and less involved than an MRI, and it might show if it's goofed up somehow. Sometimes physical therapy can help, sometimes you need medication to kill the pain, there are a couple good nerve pain medicines like Neurontin and Lyrica, which I take the latter, and it takes care of my back now. As for my goofed-up foot, I can't help but limp, but I do wear a support bandage sometimes and support shoes when I have to do a lot of walking. I also had to tighten up my tummy muscles as physical therapy, to hold by my back steady. And occasionally I will use a cane, to help keep the pressure off that foot.