Have you looked up Ankylosing Spondylitis? In the early stages, it can cause severe pain, but has not yet done enough damage to show up on an X-ray. Have you had any blood tests done? You should have a complete autoimmune panel run, but especially check for AS. Also, if its been more than 6 months since you've had an x-ray or scan, you should get a new one, and have it compared to the old. Have you tried a 2 week course of prednisone to see if the pain decreases? Prednisone is only used long term if absolutely necessary due to negative effects with extended use.
This seems to be more common in younger males 24 yrs +/-. I am 34 yrs old. I will give it a shot though. I look further to any comments or Ideas from other. Thanks for the input.