Flashing Lights / Loss of Vision 11.8.2010

About 9:30, while doing my makeup, I got these really funny lights.  Started in my peripheral vision as a white, silvery jagged line and I couldn't see anything.  Then my eyes started flitting around and I couldn't focus and then I totally couldn't see anything for about 4 minutes.  Everything felt like it was in slow motion or something and I felt like I was shaking up and down.  Called the OB and the nurse is calling me back.  I'm kind of freaking out.  It's gone now, but my head feels like it weighs 100 lbs and I just threw up.  I can't find anything on what could be causing it.