Re: The more you accomodate the more you have to give....
How elderly is your mum?
Does she have any health issues?
Which country do you live in?
Im sure there must be some sort of community service wherebys your mum could be visited by a carer for a couple of hours during the day.
As for the night time thing, im like you, I cant sleep with any noise or light. Try those eye mask things you get...im forgetting the name for them.
This fear thing she has is worrying, perhaps a visit to the GP?