Hi RobbieG,
Like many others here, I haven't had the chance to interact with you previously. However, it seems there is something that brings us all together when a fellow human being is going through so much health difficulties and pain.
Health is a funny thing. We take it for granted when we have it, not paying attention to it (even doing things to destroy it, like smoking). And then when we don't have it any more, we would do anything to get our health back, even give up on our "most treasured" toys, like you said. That's life I guess.
Having lost my father to cancer, the one thing I realize is that what you probably need most now is hope, for you and for your family. Have a search on Google for Randy Pausch, and his "Last Lecture". Even though it's a sad story in the end (Randy passed away), it's also a story full of hope. Randy fought through his illness all the way. He also lived his last few month to the full, like you are doing, and he managed to leave a legacy behind for his family and children. Honestly, the last lecture video is something you have to watch ...
Some of his most memorable words, that I have glued on my wall, are:
"We cannot change the cards we are dealt,
only how we play the hand..."
I hope your doctors manage to find what is tormenting you, and give you the right therapy to cure it. As such, I wish you speedy recovery. And don't lose your hope...