Sorry to hear about your crash, Scubagirl!
It sounds a little bit like mine last summer, but that one turned out to be not as serious as yours. The x-rays showed that nothing was broken, but still I was totally unable to move! (That is, move my left leg or right wrist.) The doctor called it ”distortion”. I had to walk on crutches for about two weeks. Then my doctor emptied my knee of 45 ml of blood, and voila, a weight was lifted from my, uhm, knee... I was back on the saddle after about two months and now I’m totally healed. I hope your case will turn out as good.