Perhaps this was one of the many possible triggers and not a cause. It’s possible that some stressful events in your life would trigger something similar at a later date. The thing is that once such an episode happens one learns about some limits and how to stay away from them. How is your health now? I used to have some slight hypomanic states which were very productive and creative but would end up with a depressed and brain foggy period before I learned to avoid those triggers. One of those for me was drinking too much coffee, poor sleep hygene and some poorly done or unattended breathing exercises which resulted in a short but very bad period of hyperventilating and a few panic attacks. Some 14-15 years have passed since and have been feeling just normal, if not much better as I have a better diet and a more ballanced lifestyle: exercise, good sleep, etc