After sitting in a meeting for a couple of hours, I stand up and get some lunch. It could be filled roll, sandwiches, sushi, or bacon & egg pie. After 3-4 minutes of eating I get a tightening in my chest, have difficulty in swallowing and get the hiccups. My throat feels quite constricted. I belch quite a lot and feel like I may throw up, although I never have. This happens about once per month when in a meeting away from home. Is it some type of heart burn?