There's been two times during a meltdown where I've acted less than favourable due to being highly emotional. These two occasions I harassed people online and became unrecognisable, and not myself. It was as if I was watching myself perform these actions but couldn't stop myself. This was when I felt like it was like a month long meltdown.
I often wonder if meltdowns can also turn into a form of psychosis where what you say and do is uncontrollable and you become manic until you snap out of it.