Grandson moving abroad

Hi has anyone had experience of a very young grandchild moving abroad? My Son and his partner are due to move to Australia in a few months. My grandson is 20 months, I've been having him for 10 hours a week since he was 6 weeks old. My heart is breaking at the thought of not seeing him. It feels like I'm sad all of the time. I know I won't be able to fly that far to see him as I'm absolutely petrified of flying. Thanks