It could be reflux- particularly if it happens to you at night when lying down. It would be unlikely to be Angina at your age, but of course you need to KNOW really in order to dismiss it & have peace of mind!
Have you noticed that it is worse with exertion or exercise? This tends to be the case with Angina. I suffer quite badly from reflux & find it can be bad when I'm lying flat- very unpleasant! It helps to lie on the left side I've found & take an antacid like Gaviscon or Mylanta- or just sip room temperature water!
You need to find the cause of the pain though- both Angina & Reflux (GERD) are conditions that need both diagnosis & treatment! Good luck & let us know how you go!