I'm fairly used to heat, because of living in Durban for a long time. Cape Town (where my home is now) gets hot too, but it cools down at night. Durban doesn't cool down.
I worked in a foundry when I was in Durban and it was intense. I had to learn to manage the heat as I couldn't afford to be overwhelmed all the time. I was living alone and didn't know anyone there, and had hardly any money.
Air conditioning made things worse for me. You always have to leave the air conditioned space at some time, and then the contrast is so bad the heat feels even worse.
Wearing hardly any clothes, staying out of the direct sun, not being active during the hottest parts of the day (not always possible), avoiding being in cars.