Definitely a scary and stressful situation. Based on my experience I have a few questions. Has Michael been diagnosed with Chronic Obstructive Pulmonary Disease (COPD)? Can he predict or does he have any warning before coughing attacks? Has he had an EEG? Has he had a sleep study? Has he been evaluated in a seizure monitoring clinic?
Not sure if he has tried this technique but Exhaling before he coughs may help him but that is a technique usually my COPD patients use to prevent the syncope episode.