Just had the same thing but Diagnosed as vertigo - lasted 10 minutes or so ( weeding on my allotment at the time! will eat out in future as less dangerous! ) Now into my second of 2 month ban from flying solo on doctors orders! so far not repeated its self.
I fly on a UK NPPL licence with a medical issued by my Doctor. The future for my flying would be far from good if I suffered another attack ( my Doctors words not mine )