It's either reflux (acid coming up from your stomach) or heart trouble. Either way, you're gonna HAVE to see the doctor! I have cardiac problems and reflux. I know!
There could be several things going on. It sounds like possible stomach problems. GERD, gastritis, an ulcer. And possible heart problems. I'm not sure of your age, you may be very young and heart problems might be ruled out. You really need to get in to see your Dr as soon as possible. You did'nt give much information so I'm not sure what is going on. It's better to be safe with any kind of feelings in your chest.