I've never been allergic to anything before. I'm healthy, nineteen years old, and never had any real health issues before. Recently, after eating certain things, I've experience a searing chest pain that feels as though an area in my esophagus, perhaps lower, is expanding. It's happened after eating a linguine type whole-wheat pasta dish, another pasta dish, but most recently a spinach salad with red onions, hard boiled eggs, bacon, cherry tomato, ranch dressing and mushrooms led to extreme discomfort and pain in my chest. Any clue as to what this is? Certain allergy, etc.?