I Woke Up Two Days Ago And Immediately Knew That

I woke up two days ago and immediately knew that something was wrong. Light headedness, spaced out feeling with slight disieness. Most acute when bending over and raising back up. Symptoms decreased as day went on and next day were decreased by 80-90%. Third day is today and now nearly gone. Still slight spaced out feeling but no other symptoms. Walked 5 miles yesterday and seven today. No difference in symptoms on first day after eating.