ulcers are typically better after you eat, could be infection, gallbladder, pancreatitis...if no changes in life/ increase stress for instance, change in diet, you need to see a gastroenterologist....how old? Something is causing and increase in acid/gastric juices, make a note of what you eat, and when - it will help with the dx. also, what is it that's new in your life,,,is it the motrin? stools normal, no changes there....gastro is the most complicated to figure out so good luck with it, a heart attack will have other associated symptoms, rare that it is just heartburn, but, as far as insurance is concerned it will make it payable to present with such concern, not just a routine physical anymore- tricky, don't wait