Massive heat makes me feel like a zombie. Dazed, walk slow, not a straight line...

Absolutely! When I try to do any type of work around the outside of the house, I can usually make it about 20 mins. or so. Then, I have to get in the house and get down, or I'll be in trouble.

I do as well. I went to a concert recently and had seats in the lawn. As I made my way to go sit with my friends, my right ankle kept giving out. A friend had to hold both of my hands and walk me to my seat.

It was a bit embarrassing but I was almost too confused/brain fog ridden to notice.

I was a bit amazed becauseI had no trouble leaving the lawn after the concert was over, as the sun had set and the heat had dissipated a bit. I had no idea it could make that big of an impact.

Yes I do.

Not right away, it's usually w/in about 20-30 min.