Me and some buddies attempted to hike up to Whitney Peak a couple of weeks back - one of us got AMS symptoms just before Consultation Lake.

We ended up camping at "Consolation Lake" and heading back down the following morning.

What possibly made it worse was that we had visited Bad Water and Death Valley a couple of days previous to the hike up Whitney.

So we effectively went from the lowest point in the USA to the highest - that probably didn't help! grin