Welcome to Mayo Connect, @ntp01. Your pain is vexing, I know, and several of our members will have comments that you will find helpful.

For myself, I can identify with your situation, because I had similar pains in my upper hip for several weeks four years ago. As in your case, neither X-ray nor MRI revealed anything helpful to a diagnosis. So I was sentenced to Physical Therapy, which failed to alleviate the pain. Turned out that it was caused by inflammation in one sacroiliac joint (the point where the foundation of the spine settles into the pelvis). The doctor who thought it might be sacroiliac inflammation told me that diagnosis is often missed, because it is conclusive proved only by successfully treating it -- injecting anti-inflammation medicine directly into the joint. If the pain goes away in a few hours, the doctor's guess was correct! The pain never returned.

So I hope you'll have the chance to ask your doctor about sacroiliac inflammation as the source of your pain. What kind of doctor told you about the X-ray results? Did the doctor propose any therapy -- medication or PT -- or further diagnosis?