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Hello, this is Dr. David. I am reviewing your question now and will be with you momentarily.
sorry about your recent bout of bronchitis.
3.5 miles up hill is quite a hike
did you drink enough water and fluids during and after the hike?
you most likely were just over exhausted and dehydrated after the hike which can cause light headedness and weakness.
make sure you stretch after hiking and that you drink enough water during and after hiking.