Pls I Need Help, I Ate Burger And Slept Immediately

Pls I need help, I ate burger and slept immediately afterwards. The next morning I started getting the urge to vomit all through the day, I consulted a doctor online and he prescribed some medications for me. But I still get the urge to vomit sometimes. My main issue is I can't stop spitting every now and then, is there any advice on how to to stop spitting saliva frequently?