I know this is an old thread, but I just found it and have been interested to read the variety of symptoms experienced by different people. My symptoms were pretty different from most described above, so perhaps I should describe them here for the record.
It was April 29, 2019. My wife and I were in Matera, Italy where we had been traveling for about 10 days. We were scheduled to fly from Bari to Catania in Sicily the next day for a further two-week tour.
I woke up in our rented apartment feeling normal, but after a cup or two of expresso, I began to have vision problems typical of an ocular migraine, i.e. weird flashing geometric patterns. I lay down for a while to see if it would go away, and that is the last thing I remember. My wife said I complained of headache, but I don't remember that.
She managed to get us packed up and out of the apartment and she drove the rental car back to Bari to the hotel where we had reserved a room near the airport. By that time I was no longer responsive. The hotel staff took me to the main Bari hospital, and I was soon transferred to the neurointensive care unit of the University of Bari hospital.
I was in a deep coma for nine days. My son and daughter fly over from the U.S. to support their mother as they expected to be saying goodbye to me.
But miraculously I slowly came out of the coma and began to improve. Fortunately my wife had purchased a one-year emergency medical evacuation policy which covered a private flight back to Virginia with pilot, co-pilot, M.D., R.N., and medical technician in a small Learjet, on May 18.
I then had 30 days in hospital rehabilitation, eventually making a complete recovery. By September, 2019, I was back to five-mile hikes in the mountains and have been essentially normal since.
By the way, I was 77 when it happened, so I'm now 80.