Killing people is a typical dream venting. Killing everyone shows that you are a little reckless when looking for ways to vent. The psychological struggle during this period shows that you have some introspection, but your desire to vent has finally gained the upper hand.
If you really suspect that you have a problem, it is recommended to go to a professional hospital for examination. It shouldn't be a big problem. I think it's because your life is too stressful.