Hopefully this is not the symptom of serious health issue but only your doctor can diagnose that.
How often do you exercise? When was the last time you did a similar level of exertion? How old are you? I couldn't do 5 minutes on the elliptical machine when I returned to regular workouts ealrlier this year. Like you I said 'I'm not that out of shape' but I was fooling myself. When I was younger I could not exercise for a long period and then step right back into playing sports but as I age I find my fitness level declines quickly without regular exercise.
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Ron
Male, Age 53 Height 5'-11"
Start, Spring 2009....,.. 270.0 lbs
January 21, 2010. ....,...255.0 lbs (Joined Fitday)
September 10, 2010..,..223.8 lbs. (-46.2lbs)
Mini-Goal......................225 Achieved 9/21/2012
Mini-Goal......................220 Achieved 10/26/2012
Current......................... 216.2 lbs.  (-53.8 lbs)
Mini-Goal....................... 215
Goal.............................. 200
My log: http://www.fitday.com/fitness/Public...Owner=rpmcduff
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