What Causes Severe Lower Back And Buttocks Pain?

I am a 39 year old female.I m experiencing sever pain in lower back, buttox, on both sides above, and below hip area, and into pelvic and lower stomach area. Sever Pain and bruising around ankles. I m not urinating as often as I should, and discomfort when I have a bowl movement. When I cough, sneeze, or any sudden movent it feels like I m getting a severe charlie horse in side, lower back, buttox, and upper leg areas. Also experience pressure at times and makes my bones in back, hips, and pelvic area feel like there being pulled out of joint. When I lie down on my back, and when standing my hip and pelvic bones feel crooked and sometimes out of joint. Also the pain is like a pinching, tense, and sometimes stabbing shooting feeling, Cannot sit for long period of times, and cannot walk without causing discomfort. My left leg at top was broke in half at the age of 6 months old and was in traction with both legs pulled up in air for six weeks, had bladder dilated when I was in the second grade, and I also have Hep C. I m wondering was is causing bruising in ankles and severe charlie horse cracking pain in my lower back,hips,legs,and pelvic area. Thank You Shelly Nations