I am so so sorry you have been dealt this blow, James. This is such a heavy thing to mourn, and its clear from your writing it is such a massive adjustment of how you see yourself and envision your future and what it might hold. Even having to dramatically limit your diet is a big loss in and of itself, though people often downplay how much pleasure that can take out of life and how much hassle that it adds. I hope you get as many good days with high mobility and low pain as humanly possible.