Are you against taking meds? There are meds that help stabilize moods. I take Lamotragine aka Lamictal and it really helps me.

My biggest problem with mood is that when I'm sensitive, I overreact. Meds won't help with reactivity, but therapy will. As stated numerous times, DBT can help with reactivity. Things like radical acceptance, wise mind, thought distortions, etc help. My Pdoc told me to compare my reaction to other people's reactions. That way I can catch myself when I'm overreacting and try to calm myself down. I still have outbursts, but they're shorter and less severe than before.