Not sure...
You just described to a T how I dump. (Imagine that twiny!!). It lasts anywhere from 20min-1hr and is miserable. Hot, Sweaty, heart pounding, dizziness, tiredness. Yup!! That's me dumping. I'm so jealous that this is the FIRST time you've experienced it. Ugh. I don't get it much but when it does happen it's miserable.