I have been blinking in and out

I was at the grave yard of my granddad funeral and I seem this yellow light in my mind so I tried to shake my head so it could go away but it didn't. All of a sudden I some how passed out and when some of my family at the grave sight grabed me I fell and they sought me down in the chair and gave be water n crackers because told them I hadn't eaten all day n it was very hot outside. So my dad n uncle put me n the car gave me more water and they drove me home. I went home and my mom called 911 and the ambulance cane and got me and took me to the hospital and they did some test on me and after a few hours they told me that I was dehydratedcabd they gave me fluids and said that needed to drink water and eat something. Ever since then I have been blinking in and out and idk what I should do!!!!!!!!!!!!!!