so I passed out skiing sugarloaf today

At the top of the climb at mile 3 in the pic above. Seriously! I reached the top, which is the intersection just past mile 3 on the map, and Mike (Pratico) and I stopped and I asked if we were going to go up trail 50 or down trail 29. I then commented that I was feeling dizzy (the same feeling you get when you stand too quickly) and the next thing I know I hear "Jeff, Jeff, are you ok?" and I woke up, still standing but with my head resting on my poles. I had actually been dreaming! For a few seconds after waking I was pretty confused where I was. I felt as if I had awakened from a pretty good sleep but Mike thought the whole thing lasted less than a minute and he was only really worried and calling me for about 10s. I can't remember putting my head down on my poles so I assume after I got the dizzy feeling I put my head down and just simultaneously passed out. Totally weird.

We resumed skiing and our next time up the same climb we took it easier and even continued up trail 50 to the top. This climb made the first climb look puny. It was a great day, other than passing out and all.

[see postscript below]

My achilles felt awesome after the ski, as if the ski were some kind of therapy. Weird. This was especially surprising because I had aggravated my achilles snowboarding Saddleback the day before. Cacky and did our first downhill day in 3 years - it was gorgeous spring skiing. The snow was excellent. I was in a thin summerweight smartwool top with Bradbury white out T and no gloves (never even took them out of my pockets). My boot rubbed my achilles from the start but didn't really aggravate it. On what became my 2nd to last run, I tried a deep front-side carve (not generally my style of riding, I'm more like a small wave ripper than old school carver) and this stretched my achilles a bit. On my next run, which became my last, every single front side turn torched my achilles. Again surprisingly I seemed no worse once I got my boots off and walked around.

Postscript - I had pretty much figured out the physiology of passing out after stopping after climbing the hill but I did some google scholaring to fill in a few blanks and quickly discovered that it is imperative that I go see the doctor to take a battery of tests to rule out a long laundry list of (mostly heart) issues. It is very, very likely to be entirely benign.