What Causes Nausea, Dizziness And Sweating After Eating?

About 30 minutes after eating, I am feeling nausea, sweating, clamy, must lay down to stop from feelin dizzy. After a bit I start to feel bloated. It has happened only twice. Once after eating split pea soup and chesse popcorn (I know weird combo) and the other time was eating a greek salad and some bread that you dip in olive oil. Today I have not had a full blown attack, but feel sick to stomach, and burping a lot and bloated.