You may have thought of these things already, but I'm also caring for someone who is finding the heat difficult so some of these ideas might help.
If you have a north facing room in the house, you might like to move into that for the time being.
Keep the blinds /curtains closed during the day to keep out direct sunlight.
Hang wet towels or sheets over an open window, it will cool any breeze coming in.
Cold wet sheets/ towels on a clothes horse /near the bed/chair will also help to cool the surroundings.
keep a basin of cool water and sponge handy to dampen down face/neck/forehead from time to time.
Make sure you keep sipping drinks/water throughout the day.
Tie long hair up in a bun/pony tail
Go barefoot in the house. Fill a hot water bottle with water & crushed ice, great for swollen feet & ankles.
Another one (though I haven't tried it myself) is to put the bed sheets into the fridge.
Hope this helps, loving the weather but it is hard on some people.