I would take a break like most of the people here are saying. But while taking your break, don't think about what you have lost or what you are trying to gain from your game. I wouldn't even think about poker to be honest with you.

Sometimes I take breaks to get away from it because sometimes online poker gets to me and I start laughing at the bad beats. In a way, there's nothing you can do if you are making the right moves when you lose. Those could just be cold streaks but when you think that you are not going to win a SNG or MTT within the next couple of days. You will find yourself playing differently and not up to your full potential. That is when the break is needed.

Take a look at your hand histories and see what your patterns are after your break and notice when you get your money in behind or make bad reads. The hand history is there for your benefit