It was a bundle of hurt, bitterness, betrayal, and fear. My brain literally felt like it exploded. According to psychiatrist, it did. I have to start paying attention to my emotions early, literally checking each hour. I have a scale, 1-10, I'm using to monitor both where I need to be and extremes. Anywhere between 3 & 7, I'm good. Once I start moving too far either way, I have prearranged actions to take to manage myself. Here they are:
Take a walk. Call a daughter. Coloring (have an adult coloring book) Deep breathing and meditation. Dance to fun playlist. Read Bible. Write in journal.
Those are a few. I was so humiliated by my total loss of control, that I finally got serious about managing the depression. You guys probably don't have to be as hyper-vigilant, but I don't see why this method couldn't work for you, too.
I've been doing so much better. No extremes because I'm paying attention and have interventions in place.