This Has Happened 3X Now In The Last Few Months.

This has happened 3X now in the last few months. Once when I was going to bed, once it woke me up and this morning I had breakfast (normal breakfast: oatmeal, berries, flaxseed,yogurt) and a half hour later it starts with my stomach burning, then burning skin, sweating, diarrhea & nausea. It lasts about 45 minutes, but stomach feels nausea for a few add'l hours. 3x in last 3 months.