The nausea you feel is caused by ozone (O3 - unstable oxygen) created during the welding process. I'd recommend an air fed welding screen and to get one that will allow you to use it as a grinding screen. There is no harm in taking extra precautions with your health as you only get one shot at it. I've known people in the past who flatly refused to weld anything that was galvanised, even out in the open. Welding fumes are nasty anyway without breathing in a load of toxic zinc fumes. Don't be put off by people who tell you they aren't affected by it - I've worked for an idiot who told me that I was being fussy when I used to feel sick - it's your health, look after it!
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Gareth Davies
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