Why did I faint? sorry-kinda long

Last night, I fainted. I was up and moving around and out of no where-down I went. I felt a little dizzy and then everything went black and I hit the floor. It was a few minutes before I could get up and my hubby had to help me. I hit my head on the corner of the wall and landed really hard on the tile floor. I now have a huge bump on my head and a bruised shoulder blade and a spitting headache even though this happened 16 hours ago. Does anyone have a clue why this would happen? I am 21 months post op. I have in the past 3 months dropped another 12 pounds without trying. I think maybe I need to check my blood work. What do I need to check- hemoglobin? B-12? Any suggestion, advice? I am kinda freaked out about this and it really scared me. Thanks-Jan

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