I don't suffer with headaches at all so I can't offer any advice to curtail them. I just use common sense to deal with this Florida heat and humidity since I have moved here in 2009.......
If I'm going outside to do yard work, I tank up on water then go outside at first light. I stay hydrated and two hours max is all I will work outside. The rest of the day I stay in air conditioning. That could be in my home or in the car as I run errands. If running errands, the time it takes to go from the car to the air conditioned buildings is all I am exposed to this oppressive heat and humidity.
Works for me.
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