Any way you choose to deal with this Jarrett, I wish you the best. I just played today a number from Arban that I had never been able to get out with all the notes from beginning to end. As modest as it is (it's not close to the end of the book!), it felt pretty darn good. I can not begin to imagine how it could be like having the freedom of playing all sorts of music and suddenly seeing it slashed in half!!
Good luck to you and concentrate on the enjoyment of it all. Music is the highest and most profound form of art ever created by humans, I feel lucky to be able to appreciate it in any way.