Last week I was prepping for a tri for Sunday, August 30th. I was hydrating, eating carbs, generally taking it easy, etc. I work up Thursday AM, got up to make the coffee, and found myself on the kitchen floor. Got up, went to talk to my wife about the episode, and went out again. We decided to go to the hospital, and went out a 3rd time. These episodes were not dizzy spells - full-on-out-like-a-light. Bruised hip, knee caps, bruised forehead, etc. I went to the hospital and had a CBC and chemistry panel done - normal. Ekg - normal. No signs that I was dehydrated with the exception that I had orthostatic hypotension - normal b/p is in the 100s and when I stood up, 80's. Heartrate - low 50s. Just a bit of history - Feb. 1 - weighed almost 222#. Now - low 170's. Train, train train - that's all I do. I do have a history of diverticulitits and I did have some pain the morning that this episode happened and the ED MD did put me on antibiotics. Nevertheless, did not feel comfortable doing the swim portion of the tri even though I swam 400 meters Friday night and did fine. I changed to a dualathon and did fine. Since Thursday, I have had zero episodes. I feel fine. But I'm concerned this might happen again - even more so when I'm out in the water. I'm in healthcare, an RN in the Cardiology field so am pretty knowledgeable in this area. I'm thinking neurogenic syncope vs. adrenal dysfunction in the setting of weight loss. Has anyone ever experienced anything like this? Any input would be appreciated. Thanks.