My son has never had any breathing difficulties in his 11 years of existence. This past winter, he experienced similar tightness in his chest and the doctor discovered he had dangerously low oxygen levels. They rushed him to the emergency room and administered a variety of breathing treatments. They determined he had pneumonia. Since then, he's had similar attacks, and now is on Advair & Albuterol (both inhaler and nebulizer) and they've helped a lot. But if he stops, the tightness comes back.

Get to a doctor.

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Though I am different from you,
We were born involved in one another.

For it was not into my ear you whispered, but into my heart. It was not my lips you kissed, but my soul.

Complete surrender should not just come at moments in which one faces overwhelming odds, but in the calm when it seems one is personally in complete control of one's life.