I didn't see this as a topic , but I have heard of it as a hormone related symptom. I am not sure what you would call this feeling...it only last a few sec. usually. I could be just sitting and talking wiht someone and all of a sudden I get this 3 sec shot of vertigo and literally feel like I lean or something wiht it cause it throws me of so much and it is gone. I sometimes close my eyes and hold my head to make it go away( not sure if this helps