I had that about 6 months ago...Just woke up one a.m. and the room was spinning like crazy...very scary. Passed pretty quickly, luckily.
I have been a migraine/headache sufferer and had one the night before so kind of passed it off as being connected to that.
Then I had mini version while driving....hmmm, I am thinking.
I am in perimenopause and did some research...
Don't know how old you are but found out that some women go through this kind of thing with "the change".
I go to naturaopathic Dr. and she agreed...suggested taking 1000 mg of Ester-C 2x a day. I don't know if just a coincedence or what, but haven't had it since....thank goodness.
I too have "low" blood pressure, so maybe that coupled with these crazy hormone changes, etc.??
Obviously you don't want to self-medicate, but I have a few women friends who this has happened to. It seems to be part of the anxiety attack, hot flash syndrome.
Lucky us!!
Good luck...hope this helps, or at least makes you feel a little better.