We did a night at Lone Pine Campground and a night at the portal, hiking Horseshoe Meadow before sleeping at the portal. All of those spots were gorgeous, by the way. We also stayed a night at Outpost and a night at Trail Camp.
I had a light headache while we were in the Whitney Zone but nothing extreme by any means, and got a little sick to my stomach on the way up the switchbacks, but nothing a granola bar and a few minutes of rest couldn't handle. We had Advil and Aleve and, using those sparingly, had an uneventful trip getting up to the summit and back.
Prior to the trip we camped at San Gorgonio and hiked Mt. Baldy.