I've learned to stop in my tracks and talk sense to myself. Sounds silly, but it actually works for me. Sometimes.

I also have mantras that I repeat that keep me grounded in one place.

I avoid known triggers, especially when I feel "twitchy" like some episode is coming.

If I feel I can be easily triggered or am in an episode, I avoid as much stimulation as I can. It all snowballs for me. So I stay in and enjoy some solitude usually.

I've also learned that sometimes when I feel depression coming, I feel a pit in my stomach and then it travels to my heart and it hurts something like impending grief, and then BOOM--depression. So, I've learned when I feel that pit to stop in my tracks, fully experience the thought and the feelings, say to myself, "Those feelings are in a cloud which is passing by, so I have no choice to let it go." And I let it go. Sometimes it helps completely and sometimes only a little, but it does help. I can't stop the feeling, but I can choose to grab onto it (and it'll grab back) or embrace it and then it flow away from me, like that cloud.

I also know to do what I need to do for ME when having an episode. And the people around me who love me accept absolutely when I tell them I have to be alone, or do this, or do that. They look after me out of love, but of course realize I'm an adult and dealing with something they cannot even comprehend in real life terms. I try to be gentle with myself, do nice things for myself, be in places I love, distract myself (try to tether myself back to earth) with projects etc (even if they are chaotic projects, like my painting often tends to be).

Those are a few things...I know I have more, I just can't think of them.

As for what the triggers themselves are, I do know them, I just can't bring them to mind. It can usually be anything with me. One little thing and off I go. But, I also know when an episode is about to happen and that itself is often a trigger for me. That's when I try to use the stuff above the most.