Hi James, I was thinking that perhaps your magnesium levels are low. There's a book called 'The Magnesium Miracle' by Dr. Carolyn Dean. Her magnesium is expensive here in Australia, but perhaps not in USA. Here is the PDF version, so free to read. https://www.scribd.com/document/335364186/The-MAGNESIUM-MIRACLE-pdf

But getting back to pushing a wheelchair, I feel that is the job of staff. I'd imagine that if anything were to happen to you, in pushing him, insurance might not cover. Just be careful. You did the right thing.