It does suggest seizure activity. Possibly. Not with certainty.
Vasodilation or a vagal episode can sometimes cause such symptoms.
Go to an emergency room immediately after the next episode. They are really good at this sort of thing. Don't hesitate to call 911 and get an ambulance. Sometimes there are irregularities that are only present within a short window.
You need a work-up because of the possibility that the next time you might have a generalized episode, which could cause danger if you were driving or near a train platform.
It sort of sounds like a seizure of some sort, there are various kinds caused by all sorts of reasons, so since there are so many possibilities, you should probably ask your doctor to perhaps refer you to a neurologist, who can do a complete workup on you, take blood, your history, run some tests to find out what's really going on and be able to provide you with the proper treatment for your type of seizure. Some people do have seizures where they remain conscious but get dizzy just like you, and one of the triggers can be stress.