Oh Yorkie. Yes that must throw up more questions than answers for you.
A part of dd's heart problem involves her left coronary artery which now takes an unusual route and is implicated in sudden death, although usually when the person is active rather than resting. It's a shame that the PM wasn't more detailed. To lose Nigel so suddenly must be very hard but coping with it in a foreign country must add to the difficulties tenfold.
I hope you have a good time when you go back to Portugal this year. x