More Hip pain

Just took an 800mg Ibuprofen. Was sitting here at work and my hip was aching so badly that I wanted to cry. I'm now waiting on pain med to work. Last Saturday I went to the 5K Susan Komen Race for the Cure in Raleigh. Sunday I paid dearly for it. What is wrong with it? Went to GP and he gave me a Prenisone taper (which I very reluctantly took - hated it and put on weight because of it) and ordered an Xray. Xray showed nothing.....zip. So after taking the Prednisone poison and it not helping I have asked Onc. to schedule an MRI. Tumor markers are fine. All blood work is fine. Something is wrong with my hip.
MRI is Monday, 6/21. I am so afraid that it will show nothing.......or show something. Either way I just want to know why my hip bothers me all the time now. And the pain has moved around in the hip. It was on the side only.....then moved across the front toward the groin area.....then around the back toward the buttock. My lower back aches sometimes and my sciatic flares sometimes also. But it all hurts....sitting, walking, standing.......all the time.
Just want to know what the issue is so I can begin fixing it. Pray it isn't mets.