Some of your symptoms suggest hyperventilation, which is inappropriate over-breathing, usually associated with anxiety. This can occur both with and without what are called panic attacks. That's not to say this is all in your head. The green mucus is strongly suggestive of infection. It is possible that you had not only bronchitis, but possibly also pneumonia, despite the allegedly clear chest x-ray. Also, given your travel, the infection could have been caused by a bacteria or virus, not usually encountered in the U.S.
Your heart rate of 45 with missed beats, light headedness and chest tightness is of greater concern. A heart rate of 45 is not uncommon for very well-conditioned athletes, but is otherwise abnormal. You should contact your doctor, with some urgency, and arrange to have an electrocardiogram (EKG). If your doctor is unavailable today, you should go to an emergency room to have an EKG. You may also wish to seek consultation with a cardiologist, especially given your family history, and may need to have heart rhythm monitoring.