I Have Been Experiencing Some Light Headiness And Brief Dizzy

I have been experiencing some light headiness and brief dizzy spells today. This morning I had finished doing some light yoga and when I started to get up from the floor I had a dizzy spell. Went ahead and attended church with no problems. When i returned home, I sat down to take off my shoes. As I leaned forward another dizzy spell occurred. I don't particularly have a problem as long as the elevation of my head doesn't drop below my waist. Blood pressure checked out @ 122/80 and I am not experiencing any nausea.