Seems to me the only negative to a hot and spicy diet is the burn on the way out. After a particularly hot dish, we would always have a bowl of ice cream and then root root root for the ice cream to win the race to our back doors.
Eat a banana before eating curry, it contains something, I've forgotten, but it interacts with the mucous in your stomach and will allow you to process the curry more easily. Also eat slowly, the slower you eat the more any harmful substances in the curry will be processed and not affect your friendly intestinal bacterium.