In reply to D Rowland: Coincidence you should ask now; three days ago I woke up later than usual, still feeling tired. I ignored the tiredness. Four hours later, feeling normal, I had lunch in a local restaurant. Suddenly, (coincidentally before paying the check) I got extremely dizzy and experienced urgency of diarhea at the same moment. Sparing you the details; another patron found me on the floor of the restroom and called an ambulance. After several hours and a thorough examination I was released from the hospital without explanation. A day later I visited my primary care physician who reviewed the Emergency Doc's report and said that in his opinion the entire incident was due to an irritation of the vagus nerve. Before this I had never heard of the Vagus nerve.
My question; What do I do if it happens again? His suggestion: "Lie on the floor with feet elevated." I'm open to other suggestions.