Predicament - can’t use left leg

[justej]

I’m a right below the knee amputee with severe bursitis in my left knee. I wore my prosthesis for 10 days in a row (taking it off at night of course) while visiting family. I got home last night and my left knee was popping and extremely sore. I had the prosthetic off today and changing was really hard. I’m unable to stand or even be on my knees to change a diaper. I’ve been try to lay down but I don’t do a very good job. I’m going out for coffee tomorrow with a friend and if I have to change while out I can prop my amputated leg and stand enough to change. I really don’t want to lay down on the floor of a Starbucks. Does anyone have any tips?? Thanks