I suffer acid reflux a lot of times. One trick I read some years ago proved to be magical: eat a teaspoon of dry, milled coffee. It works instantly and lasts for at least 2-3 hours. It can be tough to swallow the coffee at the beginning, but once you get used to it, it isn't that difficult.
A small cup of apple cider vinegar cures it for me, and is much easier (imo) to get down