I think, that it is really difficult situation to feel yourself not in your cap of tea.In my opinion, you should not think only about it, you should focus on more important things.Sometimes, this method don't work.You should digress.You can go for a walk.You can listen music.You can make a party or visit your friends.You can discuss this situation with your parents.You can help disabled. Finally, look at the problem in other point of view!