Having lived abroad for quite a while, I automatically go into heat mode. So I tend to be awake very early anyway, so if I need to go to supermarket go about 6am, , if I have to walk out in the heat, always look for the shady side of road to walk along. Wear cotton, with spare tops etc in my bag. Put a flannel in very cold water and wring out so not dripping. Put in a plastic bag and then put a small towel round that bag. In the car in the heat put this round your neck, lovely and cooling. If I am walking about, have flannel in plastic bag in my shopping bag so can use it to clean up and cool down. All windows open to a safe level and all curtains shut until evening. What cooking I do is usually either very early in the morning or late in the evening. Try to be sure I have made enough whatever to provide 2 meals from the one cook. Have plenty of salad stuff in. Put bottles of water in the fridge to be cool to drink.
You also find out exactly how much you like or dislike something. When you are prepared to still go out in the heat, you obviously love whatever it is. If you cant be bothered to go to something, perhaps you could leave that and still have some time to yourself. But most of all so long as I am clean and my clothes are clean the rest can go hang. I make the most of the lovely weather and enjoy it. Sad that I cannot go swimming yet but once I can go there it will be great.