I have a prescription for Ondansetron to quickly stop the nausea. It dissolves instantly on the tongue. Whenever I get nauseous, it scares me because I don't know if it's a sign of an oncoming seizure or not. Taking the pill has the flow on effect of calming me down when the nausea stops.
It's been very helpful in my case. It may not be right for you, but I thought I should mention it.