I was so skeptical about them, but I saw some on Amazon for a couple of quid and decided to give them a try. They didn't seem to do much when I tried them the other day, but I was feeling rough as boots this morning so put them on again, a bit closer to my wrists. Magic! Nausea definitely lifted and I can get on with my day.
I realise this sounds a bit like an ad but it's honestly not. There are literally hundreds of different brands - I can't even remember the name of the ones I bought.