I think it's really important to note the everyone is different in how they will or will not feel the effects of AMS. That's the importance of pre Whitney hikes above 10,000 feet. I had several hikes above 10,000 before my first Whitney summit. After my first hike I had congestion in my lungs and kept spitting out yellow junk for days. And that was only to 10,200 feet. I kept doing my hikes above 10,000 and never had that happen again. I've had slight headaches every time I go above 12,000 and also nausea, but never bad.
My friend goes to La Paz Bolivia to see his wife's family and he always gets headaches at the hotel in La Paz (12,000 feet.) His son has never had headaches and neither has his 80 year old mother. At the hotel in La Paz, they deliver oxygen canisters to your room. Again, different for everybody.
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