This has happened to me 2 times in my lifetime and started this year (2016) It starts with stomach pain, about 4-6 hours later I get really dizzy, cramping in stomach, horrible pain below belly button, so bad I cannot talk, my skin turns pail and I sweat alot, then I faint and fall to the ground then wake up seconds later. Pain is still intense under belly button area. Pain is relieved by diarrhea... This has only happened twice. And family have eaten what I have all day and they do not get those symptoms.