Being calm when the market falls (especially, when it lasts months... ARGH!) is by no means easy, but look at it this way. The market went down, but hey, you're still alive and kicking. Hopefully, you didn't put all your eggs in the same basket, did you? So you have something to live on. That's what I say to myself whenever anything happens because it isn't the market that should scare you, I say, it's the panic that may come from my negative emotions and lead to a big error I will regret...
When I think of it, it helps, but it might not work for everyone, so find your own ways. If mine proves to be good for you, I'm happy