Have you tried ice, or alternating ice and heat, concentrating on the sorest points?
Also, since you have known necrosis, did you have any imaging after your fall to see what might have been damaged?
One thing I learned when I had bursitis in my hip was to avoid the sofa and soft chairs - seems counterintuitive, but a firm chair with firm contoured cushion actually helped the pain.
I wish you luck in getting through this.
Sue