[Neil]

Originally Posted by MargaretR

I can't help with the migraine problem, but I googled this for you
OxyFit Oxygen in a can (2 litres)

I might even try one of those cans myself

The website say

SUFFICIENT FOR 10-20 BREATHS

What a waste of £10 that is

It also says this in smaller writing

This product is not intended to treat, prevent, diagnose or cure any disease or medical condition. Always consult a physician or medical practitioner before taking this product.