Altitude, finally

We've spent the last two nights camping above 9,600 ft and hiked two days as high as 10,500 ft. I can feel the elevation, but so far it hasn't bothered me much. I felt light headed for 15 minutes the first night, but did a good job of staying more hydrated and used pressure breathing to keep my oxygen levels up. That seemed to work. Some of the others in my group are starting to feel altitude effects as well.  All good prep for Whitney.