I was at dinner with my dad and after dinner, he seemed to be a little uncomfortable, but steady. Then a few seconds later, he began vomiting. This happened about two years ago while out at dinner. That time, he seemed to loose consciousness and the vomiting lasted longer. Today he was sweating and warm, but seemed to be okay right after. He also has a mass on his neck that is being removed. His liver, kidney, stomach have been tested and nothing found as far as cancer. I am wondering if the mass and this vomiting are related.