Sorry to hear that you are having a rough day. It does settle down into a more even keel over time but those days will pop up!
We control so much of our own happiness, though. I know the temptation to check his soial networking pages must be very strong but does it really help you? All it shows is something that he has done NOW based on how he feels NOW which may be reversed in time. And if seeing these things gets you in a head spin, maybe its not worth it. We can't control how anyone will react or hurt us but we can certainly control how much we hurt ourselves.