Acid reflux?
Pauly is correct, you don't want to wait too long before seeing your doctor. Severe untreated reflux is a leading cause of esophageal cancer.......it took my father.
If it bothers you during the day a great natural remedy is almonds. Besides being very good for you, raw or roasted without the salt and chemical smoke neutralizes stomach acid. I've been eating them for a few years and am thrilled at how well they work.