hey! i live in texas and i will tell you in my experience with this junk (whatever it is) that when i get hot or am outside too long, the dizzies or unsteadiness is definitely worse for me. it almost also triggers a panic response as well.
I'm the opposite. Cold, rainy weather is what gets me. Particularly when there is a chill in the wind and fog everywhere - which is often at the moment as I am only 2 hours away from the ski fields in Australia.
I seem to do ok in summer and generally feel more energetic etc. Of course if I get too hot then I tend to have fainting spells - but that has happened my whole life.