its reflux, , basically the flap that closes off your esophagus is either being lazy or is temporarily damaged(due to throwing up, couphing or stomach acid eruption.,this is allowing your stomach acid to creep into your throat when normally the esophageal flap would prevent that. You can take tums, papaya enzymes, drink water with baking soda in it, or juice a raw potato and add water to it, or coconut nectar . Limit your ingestion of tomatoes and tomato products, onions, garlic,mint, coffee, alcohol and creamy cheeses. Try to ingest alkaline foods. Sleep with your head propped up a bit and lying on your left side can help alleviate symptoms.
I never had this in my life until a few months ago, and then i had it for like 3 weeks strait. It was terrible! I did all the research i could and i tried everything i said above. Limiting the offending foods was the most helpful.