Never heard of it sorry :(
Happened to me only a couple times so far... Where I suddenly felt extremely hot.. Started sweating like crazy... Then my vision goes blurry... Get dizzy... If I don't sit down immediately I'll pass out. Doc says not to worry just another one of those lovely pregnancy symptoms. My friend had the same during her pregnancy.. Even almost passed out while driving and her doc told her it was normal too... Guess they know best even though it's totally alarming and scary for us. I didn't know it was called a hormonal dump though... My doc just talked about blood pressure suddenly dropping.
That's exactly what happens to me! If I don't sit down in half a second I'll pass out. It happened to me at my appointment today and she checked my blood pressure said it was a little low but she said it's very rare but some women just get giant hormonal dumps. I guess we are some of those women. And it is totally scary! My husband doesn't let me drive anymore bc it happens so often...