Heartburn

This may not be the problem you have, but it's one I had for years. I thought it was heartburn and I kept popping antacids, which worked but had lots of sugar which was very bad for my teeth. Finally by happenstance I found out it was gas (I had bad reactions to garlic and onions, which are the second largest causes of gas after legumes, according to internet research), and burping a lot, strangely enough, got rid of the gas, after a lot of burps. Maybe I was just naive and misinformed, but doctors couldn't identify the problem. If you get that acid taste when you have it, gas is probably not your problem. Have you googled acid reflux?

drugs can be bad. so try alkaseltzer, 1 part baking soda and 2 parts hot water, crackers, lots of water, vitamin e oil capsules, talk to doctor about ranitadine(zantac), and live a less stressful life. this is because most stomach aches/heartburn can be caused by stress which results in temporary cease of bile production (balances stomach acid) or over production of stomach acid which can eventually lead to ulcers by the way im twelve with the same problem