Jemian, Intense heat/humidity gives me headaches, too, unless I do absolutely NOTHING. (something I’m actually quite good at!)
Keep that water going and DO stay inside. We have a “red alert” telling all vulnerable categories (elderly/asthmatics, etc) to stay indoors. 105, as the index is here is 105, and has to be worse in AL.
Your advice is good and I'm following it to the letter.
Ed, where are you in VA? Are you near the district? We live in Chantilly....