There are other meds if the ones you are taking aren't working. When I feel that I am definitely going to throw up I grab the bottle of paregoric.
Paregoric isn't to be taken lightly. It's an opiate. But it does the job in an emergency when nothing else is working. It tastes really awful but stops the vomiting reflex instantly.
There are other anti nausea meds too: Emend, antivert, ativan, compazine, lots more.
Yes, vomiting can wreck the wrap. I have a barium swallow coming up in a couple of weeks to check if I have reherniated after vomiting just once. Since that incident I have felt different, can now burp, have some pain mid sternum where the old hernia was.