I had the very same problem just weeks ago and have been diagnosed with eustachian tube dysfunction, which is basically a blockage of the tube leading from your inner ear to the back of your throat, it's probably nothing serious although I would consider going to your gp, I was prescribed a steroid nose spray and the problem went in no time
There is no way to tell - without seeing a doctor. So please go see a doctor. It can be something simple like ear or sinus issue that cause vertigo - and that can be very disorienting.
Go see your GP or an ENT and they can evaluate you and if it is something more serious - it will be picked up there. Do let us know how it all turns out.