Sounds like you earned the pain. I remember getting cramps in my quads and calves while preparing to play the collected opus of a graduate composition class a few years ago. Which makes me think of David del Tredici, who was on the faculty at this college, who describes the harp as “a slow piano.” Too bad not all composers follow that concept. What other instrument induces injury when put through the paces of a chromatic line?
Ha ha! That must be it! It’s a miracle I don’t have tendinitis too, from re-writing the impossible bits, or re-copying them to make them understandable.