I had my Fundoplication in October 2008. I had the same concern. I have two prescriptions for anti-nausea medications to take if I start getting some nausea to help provent the need to vomit. The one that is most effective for me if the Zofran that melts under the tongue.
Unfortunately, last October, I got a bad Gastroenteritis bug. My stomach found a way for the vomit to come up. It was quite forceful. The other times, it is just a dry heave feel. I can say that I still worry about potential damage from the day I was sick. I worry about pulling the stitches or having my stomach slip. Not much I can do to provent either though.
Good luck,
MountainReader