Overview
There is no such thing as a bad emotion -- all emotions are valid, so don't try to suppress a sudden feeling today, no matter how inconvenient your emotionality might be. Not only is it unhealthy, it's a huge waste of energy. Getting all hung up about what a 'good' feeling is or a 'bad' feeling is only creates more stress in your life. And when you are more stressed out, people don't want to hang around you. So relax, and if you suddenly get grumpy, so what? Go with it, and try not to take it out on anyone.