Welcome to the boards, Kate!

I think you will find this a warm inviting environment, I certainly do!
I am 17 and have been dxed when I was 14 and I've been around the block a couple of times, what with hospitalizations, long term facilities, and finally regular life. So, I know a thing or two, even though I'm young.
I am an ultra rapid cycler, but my pdoc says it doesn't matter what I am, he treats the symptoms not the label. I wouldn't get too caught up in what you are, just how you are feeling. Yet, at the same time I understand what it feels like to just want a name for this horribleness. (is that a word?

)
I agree with Angel, a mood chart is a great idea. I have one, and although I haven't done it in a while, it is helpful and worthwhile. I have also found that exercise, eating right, and most importantly a regular sleep schedule help. It sounds like Duh I know that, but I think it's harder than it sounds.
Welcome, and feel free to post when you want or need and the wonderful people here are always full of advice! Can't wait to hear more from you,
--steamroll