Trataka Meditation

I have recently begun the practice of trataka meditations. It seems most powerful. I have read some things warning that the advanced forms are “dangerous” without the guidance of a teacher or guru. In the past couple of years, I have experienced what I can only describe as a rapid vertical growth trajectory. Given my past experience with sudden and extreme kundialini, I’m wondering what is meant by “dangerous” and if I should be concerned about this. While this whole opening and re-awakening thing is still pretty amazing, I don’t want to trigger another episode of the same confused, uncharacteristic and unexplainable personality behavior. Thanks for your advice.