I'm pretty reluctant to go along with the idea that a small canister of Oxygen would make much difference for someone experiencing AMS symptoms such as nausea and headache.
It could very well help you feel better, but how long is that increased oxygen going to stay in your system ... a minute or two? And then you are back to dealing with the effects of the high altitude again.
There is quite a bit of evidence that Diamox can help people. But I've not seen much on supplemental oxygen making a significant difference.
