Hi Diane,
Do I read correctly that while you made a few hikes at altitude before your dayhike, there was no sleeping at altitude before the trip?
This sleeping at altitude before summiting seems to make a world of difference. Steve C & I were part of a group that slept over on the Whitney summit after two nights prior at 10K. Other than being cold, I felt no different than at sea level when I woke up the next morn at 14k.
