My Husband Become Nauseous, Vomited , Then Drove Home (about

My husband become nauseous, vomited , then drove home (about 15 minutes), drove in the driveway and pushed the button to open the garage, then woke up ten minutes later in the car with it still running. He is 81, and still works full time. He just called me at work to tell me this. He has no heart problems that we are aware of, and is not diabetic, nor does he have high blood pressure. Do you have any suggestions?