To Katyj,
Your remark, unintended, was insensitive to all those who have children overseas. To assume parents who have already been through this when their kids originally left, are accustomed to the distance, is a fallacy.
They repeatedly suffer these feelings continuously with each and every milestone and event—when their children left, when their children had children, with every birthday/holiday and with every visit and goodbye. The truth is that as soon as they adjust, it reappears. It is an irreplaceable loss that comes and goes.
And to all those experiencing this pain from distance, my sympathies. You will get through it and there is no other way to avoid the sadness. However, there will hopefully come a time when life actually resumes to a sense of “normalcy”.