Hi all - I'm after recommendations for face masks please. We're going to USA and have to wear face masks on the plane (so 8 hours) I can wear a mask for an hour or so but after that it makes me panicky (anxiety) I could get a letter off gp but would have to pay for it so my question is does anybody recommend any face masks - there are loads on amazon/ebay but I just want to get a decent one that I can wear without making me panicky