Has anyone had any fainting spells or black outs after WLS?

I had open RNY on 1-19-00, to date my unofficial weight loss is about 45 lbs. Lately, I have been experiencing "black outs" and "fainting spells". My daily supplements include, two multivitamins, sub-ligual b-12, magnesium, biotin, st. johns wart, iron, and zinc. I am having a hard time getting my protein and h2o in. Could this be the reason? I feel dizzy when I get up too fast. It is scary especially since it happened at a store as I was trying on a pair of shoes and I had my daughter with me. Has anyone experienced the same thing? Thanks in advance.

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