Mask? Curious to knowing what that is if you don't mind lol. Sorry I'm no help :/
Sry I don't know what it's called, but you put it over your mouth and nose and breath it in...
Nitrous oxide! I didn't have it but I was still in some pretty uncomfortable pain with an epidural! I think it's whatever you can handle, it would definitely probably help take off some of the edge and anxiety!!! It depends on how high they crank it too, lol. I got just regular oxygen when I was pushing ontop of my epidural and it helped me breathe!
Okay, I'll remember that. Thanks!