Chest/heart pain help?

Could be indigestion. But it sounds to me like some kind of pulled muscle. Get a hot water bottle and hold it to your chest/back. If that eases the pain you know it's nothing too serious. I doubt it's anything more serious, like a heart attack as you usually get other symptoms like pins & needles in your arm. Try the heat pack / hot water bottle if I were you, then if you still get pain see if your GP can fit you in this morning. Hope it works out ok.