I am in the same boat of caring for elderly parent with degenerative Neuro disease [Not Alzheimers]
btw Often the hip breaks which causes the fall [Osteoporosis].
I trust you have others who can assist you with support. Also the medical costs can be crippling - in our case Grandpa who passed in 2009 had no life insurance - why? Because when he wanted to take one out [45 years ago] he was told he was showing lack of faith - afterall the world was going to end in 1975 - so gran ended up in the Shit ! And by extension the children - we - now carry the financial can.
I feel for you and empathize with you.