I was very sad to read this and so sorry for what you are going through.  I wish I knew enough to help but sadly I don't.  Do you have enough money to consider a nursing home? Do you have family friends who might help? 

Have you looked into the benefits available?  This could help towards paying for additional support.

We all react to chemo differently so this might not be your experience, but I was on a three week cycle.  So I was totally useless for three days,  but then by week three getting a bit more like my normal self.  So maybe plan to for any chores on the last week before the chemo, especially doing yourself a favour like batch cooking dinners to stick in the freezer or buying microwave meals for the freezer.  Macmillan have a cook book for people with cancer.