I was riding a 23 mile ride in March 2017. 4.1 miles into the ride I looked over my right shoulder twice to see if there were some dogs coming from a property I was riding past. They weren't so I settled in and kept riding. Seconds later everything went black. I woke up in an EMS vehicle and ended up in the ER and then ICU for three days with a subarachnoid brain hemorrhage (my helmet saved my life and broke into 5 pieces). Electrophysiologists/cardiologists were convinced it was my heart. I now have a heart loop recorder implant until at least Oct. 2017. I lost my job because I cannot drive until Oct. 2017. It has been a nightmare. They tested blood glucose etc and nothing out of the ordinary. After 2 months the loop recorder was checked...nothing out of the ordinary. I ride 5000-6000 miles a summer and average 34 miles a day. I used to run marathons/road races/cross country/track (best times were 2:24 marathon and 30:08 (10K). I rode around Lake Tahoe in 4 hours in 2015 and it was easy. I have no idea what happened to make me pass out. It turned out to be a disaster. Medical bills/job loss/ can't get disability/turned down twice for unemployment. All testing has shown nothing to be abnormal. I personally do not think it was my heart. I don't know for sure what happened, but I hope it doesn't happen again.