If I'm using anything else than MP5, I start using MP5. If I'm already using MP5, I either switch to Steyr or I'll just try playing better, depending on the situation/map. On some big and open maps i rather use Minimi though and if I'm playing on ctf_Division and going low and my opponent isn't using Barrett, I use Spas.
Also, I don't get angry very often these days. I got angry alot when playing Soldat before, but I've noticed it just makes me play the game worse.