SOPP736: Advice about my situation as a passionate organist with health problems

Let's start episode 736 of Secrets of Organ Playing Podcast. This question was sent by Alessandro and he writes:

I am writing to you to ask for advice about my situation as a passionate organist with health problems. I suffer from diabetes, therefore I have problems with the pedalboard to find the notes due to the decrease of the sense of position, typical of the disease. I also have vision problems with difficulty reading the three staves at the same time. I had built in the past, a good repertoire, even done some recitals. Now I feel like I have lost everything. I was already a slow learner, now it takes me a long time to study a piece. In a month I would like to show a friend the first movement of the Eb major Trio Sonata, and the Dorian Toccata by Bach, but the effort and the mistakes are so many, and, if I think that I mastered these pieces, I get discouraged and go days without practicing. I would almost like to start studying (or revising) the organ from scratch because I really like it a lot. I wanted to ask you if you have any advice or any of your courses to propose to me, that would help me rebuild a repertoire gradually and with confidence. (Years ago I completed your course about first sight reading). Thank you for your attention. Greetings 

Alessandro