back pain with hip pain, pelvic pain and leg pain

I have had hip pain for some time now, In the last few months it has become much worse. Now it involves my lower back, (I have 3 compressed discs and arthritis in my lower back), my entire buttock area, hips and both legs, mostly down to my knees. I cannot "squat" without severe pain and help getting up. I have tried physical therapy which did not work, and am now scheduled for an MRI. This causes problems in my everyday life including sleeping. The pain is constant, does not go away at all although the pain does vary sometimes. I am getting real frustrated, anybody have the same symptoms? I am on Vicodin, it takes some of the edge off but clearly dose not take the pain away.