Buy this far infrared heating pad from Amazon and sleep on it every night AND sleep with a pillow under one knee and night. You will not believe how much pain relief you can get from doing this.

VentureHeat VH-KB-2636 Black 26" x 36" At-Home Deluxe Heat Therapy Pad

I have a friend who has systemic scleroderma which is very painful and debilitating. She tried this and then said that she could not believe the difference that it has made in her being able to even get out of bed in the morning.