Hi danny,I don't know the illness ME, so I can't say anything about that.It would be interesting, if there is some direct or indirect connection betweenthe occurence of your illness and your intense piano practising (it sounds tome, as you're very ambitous in this respect).
My only advise here is: if you can't play fast - play slow!If you like the music, playing slow will enhance the fun.If you don't like the music, you have to play extreme fast, so you will arrive at the end of the piece much earlier
ThanksWhat's your practicing tecnique?Does it allow you to learn pieces quickly?