I managed to speak very briefly to the cardiologist who wanted me to have my Cardiac MRI.
The good news was that I do not need any further treatment just at the moment and she ok'd the Amsterdam trip.
Not so good was that she said the MRI showed my heart has been damaged as a result of the heart attack and other operations I've had and unfortunately it can't be repaired. So it looks like things may not improve. I'll have to live with it.