MANY thanks for the prayers. They are much appreciated, and I think they are working.
Quick update (b/c I just got home and am exhausted)... He's being released, but has to go to his cardiologist. He had a head cat scan, another EKG, chest x-ray, etc., etc. (a billion tests). All came back normal and basically they can't tell us what happened. He got some fluids and is feeling and looking better... so they are sending him home.
If it happens again, he has to be admitted. Hopefully it is just a fluke or some dehydration (though doubtful with how much water he drank today) -- there's just no other explanation right now. It was scary.
I TRULY appreciate all the prayers. I really think they are working.