It's been a couple of years for me, but it's been a recurring issue since I was a kid. Doctors have since diagnosed me with unusually small vestibular aqueducts and either endolymphatic hydrops or Meniere's. I'm also deaf in the right ear... all I get is ringing.
The last time it happened, I got on the bike dizzy and it got worse. Made it halfway to work, sat on the sidewalk for an hour, then rode VERY CAREFULLY to light rail to return home. Got home, threw up, and slept it off.
__________________
--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7