What do you do when you're tilted to cooldown?

I went on a massive losing streak tonight, losing Silver 1 and dropping deep into Silver 2. I know I played poorly in some games, made bad judgement calls at times, but shit. It's really fucking bad going on a losing streak and it reminds me of when I was in Bronze trying to get out. I just want to know, what do other people do when they tilt and need to just calm down and get their shit together? I tried playing Hearthstone but even that really didn't help because of how repetitive the opponents get. Anybody have any good suggestions I can try next time I am on tilt?