When where you are and where you wish to be are the same; you're perfectly content and pure happiness is the case. When the mind wishes to be elsewhere, anguish arises.
The solution, then, is not to move the body to the mind's ever changing desires, but to let the mind accept the reality of where you are. You can't change the past, or the future. On not changing the past, your birthplace, actions, events, then this moment is all it could ever have been, the only possible reality.
You can check out Ta-Wan's other musings here.