having trouble breathing.

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Soooo, I've been a runner/soccer player my whole life. I stopped when I came to college 2 1/2 years ago and gained 30ish lbs. I walk regularly, and I've tried running and a combination of walking/running, but after about 10 minutes of running I feel like I'm about to pass out from the inability to breath. I've tried the "in through the nose, out through the mouth" thing and every other combination you can imagine and it doesn't work. Does anyone else suffer from this, or is it just me? Should I seek medical help?

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