Doc diagnosed it as classic severe AMS but not Hape or the worse one that are life threatening.
When I ski out west I alway carry a platypus water bladder and I drank several liters of water that day followed by electrolyte drinks after. I did have two low test 4 percent beers that night which may have been my undoing. The hot tub was also blazing hot so that might have hurt too but I only sat in it for 5 mins.
Everything back to norm now at home.
if You French Fry when you should Pizza you are going to have a bad time