Yes. Tea is acidic (tannic acid) and can contribute to heartburn. The caffeine in tea can also aggravate heartburn.
Most fruits (and their juices) are acidic, and any acid foods can contribute to heartburn.
As with most things, pepsi in moderation should be OK, but excessive consumption of any cola can contribute to heartburn. Colas contain carbonic acid (that causes the fizz) and caffeine, and both of these can aggravate heartburn.
Salty foods, acidic foods and heavy starches contribute to heartburn. WebMD is a great resource for all things medical. Using this site will give you information about heartburn remedies, helping to determine if it is right for you.
a basketball sized gallstone
Vinegar is acetic acid and it's going to contribute to acid reflux.
Gallstone ileus, which results from a gallstone's blocking the entrance to the large intestine, is most common in elderly people. Surgery usually cures this condition.
An incision into a gallstone to remove it
Gallstone formation is seen in twice as many women as men
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Fat.
The largest gallstone removed from a patient weighed 5.5 pounds and was the size of a rugby ball. It was extracted in India in 2016.