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I keep collapsing. The first time it happened was about an hour after medium exercise; I felt nauseous, sweaty, blurry vision and, if I hadn't sat down, I felt that I would have blacked out. I recovered in minutes. There was no pain or shortness of breath. This is now happening every other day (always at rest)!
I'm a standard 54 year old male. I feel fit and healthy, train 5-10 hours a week and have achieved personal records of 39 minute 10k, 3,220m 12-minute Cooper test and a 3.20 marathon in 2007.
My stress ECG was normal achieving a comfortable 16 minutes on Bruce protocol and echocardiogram showed nothing. Blood tests were normal and I've not had a heart attack.
Doctors think I might have a high vagal tone. I'm booked in for a tilt table test.
What will this do to my running? Will I be able to carry on?
I'd be very grateful for any ideas as I'd never heard of this condition before.