Yesterday I went to dinner with my dad and suddenly had a horrible dizzy spell where the room felt like it was spinning, and I thought I was going to faint. It wasn't just a bit of shakiness, my vision actually seemed to twirl around for a few moments like I was spinning and in a free fall.

I thought it could have been from low blood sugar but I had a protein shake and a sandwich with a banana for lunch so I can't imagine it would be that. Maybe dehydration, but I usually drink a fair amount of water. 

It was the first time I had gone out to a restaurant in a while and I'm wondering if just the visual overload / sensory stimulus could have triggered a bit of vertigo. The last time I can recall a similar thing happening was during my very first panic attack years ago, where the room felt like it was spinning, but it hasn't occurred in recent memory so it was REALLY frightening tbh. Especially because I was in public and didn't know how to handle if it happened again.

Has anyone else had this happen before? How do you manage it when it occurs?