Vomiting won't get them out. If when you vomit you're bringing up matter from where they live then you've got much bigger problems than just a worms infection.
Possibly but I wouldn't have thought that would count for 90% of the missions it can perform. My understanding is it's a versatile platform with stealth. So should still be plenty it can do without the stealth part. The planes it is replacing weren't stealth.
Vomiting won't get them out. If when you vomit you're bringing up matter from where they live then you've got much bigger problems than just a worms infection.