Hi,
How are you? Dehydration is one big consideration especially if the heat is too much in Florida. Increased fluid intake is important. Dame has raised some important points as well. Try to avoid eating inside your car as well. If your headaches persist, check with your doctor for proper evaluation. Take care and do keep us posted.
is there a cafeteria you could eat in instead of your car? I would think that a combination of the heat, CO2, and dehydration would be ganging up on you. Try shifting your routine and drinking more water and see if it helps.
If not, you might want to schedule an appointment with a doc and make sure you're not missing something.
~Dame