So, weather you fit the DSM IV's checklist for Bipolar or not, you do not indeed have a mental illness untill it interferes with your life; work, family, friends, something. I agree with someone elses comment about seeing a doctor when you have an episode, if they are so infrequent as 8 years. And, also, it seems like you are pretty insightful and willing to seek help when you have a problem. I would suggest that you don't let this incident interfere with your ability to seek help in the future if you need it. Good luck!