I agree with this.

You'll want a professional opinion anyways so that you can get the proper help for whatever you have (be it bipolar, cyclothymia, or something else). And the other thing is, doctors don't like people who self diagnose. I'm not saying your opinion is wrong, because you could be right, but they just don't like when you do that. They get a little leery. So if you do seek help, let them come up with their opinion first, then have a conversation.