I was on my bus that I ran for to make and halfway to my stop everything started to get brighter. Then, just before I was about to get off at the station everything was really bright to the point objects were completely white and I can see the outline of them all. I also felt nauseous. I sat down quickly and took a good 5 minute breather until I sat in the area for my bus.

I've been home for over an hour and was wondering, what should I do to after I had the feeling of passing out or to prevent something from happening later?