I also have a prescription for the antianxiety drug Klonopin in case I can not cope with turbulence or a snoring seatmate (I'm flying in what I call Deep Vein Thrombosis Class).
Faced with sitting between my two disgusted seatmates with a bag of warm vomit on my lap, I chose the only marginally better option: I rang the call button and handed a (understanding, but visibly repulsed) flight attendant the bag of sick.