There is no word for feeling nostalgic about the future but that's what a parent's tears often are a nostalgia for something that has not yet occurred. They are the pain of hope the helplessness of hope and finally the surrender to hope.
I worked for the Office of Management and Budget in the White House on nuclear energy policy. But I decided it would be much more fun to have a specialty food store so I left Washington D.C. and moved to the Hamptons. And how glad I am that I did!