Question: what to do when you keep throwing up stomach acid?
Answer: Let Your Stomach Rest. When you are treating vomiting due to a stomach bug, or gastroenteritis,1﻿﻿ the first step is to let your stomach rest. ... 
Drink Fluids to Prevent Dehydration. ... 
Progress to the BRAT Diet. ... 
Progress to a Normal Diet. ... 
Treating Vomiting With Medications. ... 
If Your Vomiting Is Still Not Under Control.