I was having horrible heartburn, and couldn't narrow it down to any specific trigger. My doctor did the test for h pylori, and that came back negative. She put me on Prilosec for a month and that helped. The heartburn went away and I'm no longer on Prilosec. Occasionally, I'll now get heartburn after eating spicy food or drinking coffee, and I can just take a couple of Tums and it goes away.

Good luck figuring out how to solve your problem!