That's exactly it. That sounds like Bipolar I. It has very high mania. Like major mania. What you described: the feeling invincible sort of.

I have Bipolar II. Hypomania...so very minor. When that hits, it's insane happiness, rushing thoughts, but I don't really tempt fate or think I am invincible. I have more periods of depression than anything else usually.

This forum is really good for these questions and support. I'm new and never found anything like it so far. We're all struggling with something (many of us Bipolar) and are here to help each other. Yes, it sounds like Bipolar without a doubt, but you'll get through it. It's possible! =)