Coughing spasms/losing consciousness
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Has he been back to the Pulmonologist after all these tests? Also being overweight can contribute to many of his health related problems, even the asthma. Hopefully he is a non-smoker? If not, that would definitely cause the asthma to flair.
I assume since he's seeing a Pulmonologist, they have ruled out other lung problems such as Chronic Pulmonary Obstructive Disease (COPD) and Emphysema?
It definitely seems like further medical evaluation is necessary. If you are not happy with the current Pulmonologists answers, seek a second opinion. Good luck!