Ways to control bipolar-ness?

So today was one of my bad days.
I went from being in a really great mood to being extremely pessamistic. I was worse than I've ever been. I didn't care about anything that is usually importanat to me and was just really, excuse my language, *****y.
I was so negative against my relationship and started doubting it A LOT.
is this all normal? how do I get myself out of this mood?

For ME that kind of thing is normal. And to be honest if I'm "in a mood" I just have to wait it out. I try not to talk to anyone too much if I can help it. Yes I realize that's entirely not a proactive way of dealing with the problem, that's just how I typically cope so that I can avoid explanations or apologies the next day. (And I'm an introvert by nature... but that's just me.) Literally try to remove yourself from the situation if you can. I mean, this kind of tactic is beneficial to anyone... bipolar or not.

For me it's not something I can actively control or change. If it were I probably wouldn't be here!

I have pretend conversations in my head with people. I'll scream and yell in my brain at them if I'm upset. Basically, I just say ALL the thoughts that are going on. And then I tend to imagine how they'd respond if I was to do that - and that usually gives me the benefit of having "expressed" the emotions, gotten a response, and know that it's not a good idea. The negative to that: I often feel guilty for things I haven't said! haha.

Aside from that, I take time out for myself and try to do things that are relaxing. It calms me down, with the added benefit of being removed from the people I'm likely to snap at.

I do this constantly... literally constantly. I actually got a little excited just there knowing that I'm not the only one that does it!

It took me a bit to decide to admit it haha - I don't know how other people think, but mine is ENTIRELY in conversation - I'm constantly babbling away in my head to myself and other parts of myself or other people I know. Or sometimes it's like I'm giving a speech to a group of people who aren't there. bahaha.

when I get stuck in a cycle doing this, the conversation repeats and repeats and it escalades each time and there is no way out of it. more and more doom each time it repeats until I am actually suffering cuz of it.

Yes, I do this all the time, too. And it is helpful. I'll do this out loud in the car or when I'm by myself. I often end up pacing in circles.

Tracking moods is helpful for me. Becoming aware of my moods and triggers helps me. Having a name for what's going on is a good thing.

Coping skills are important. Identifying the mood is the first step, then having a plan set up in advance is good. It's hard and doesn't always work out, but telling myself calming things or focusing on something else like watching t.v. Telling everyone around me that mood isn't good is also a good thing because that helps them know what's going on.