My back and hip x-rays were normal. It took an MRI to find that I had a herniated disc - and it's a big one. I almost refused to have an MRI, I was so convinced it wasn't my back.--

You've tried a lot of things, but an x-ray won't rule out a back problem. Keep thinking positive on recovery. Even if it does turn out to be a back problem, there are plenty of threads and posts from people who have gotten through it. I'll be thinking of you.