I have a question about fainting

I had surgery almost 6 months ago (gastric bypass...lap) and was considered a light weight...had about 125 pounds to lose. I have already lost 110 in this short time and am concerned because starting a month ago every time I stand up I get dizzy and everything goes black. I passed out last week onto my coffee table. The problem seems to be getting worse daily. I have called my surgeons office several times and finally was able to speak to a nurse. She was concerned about losing so much so fast and said I need to see my doctor in my town for a full set of labs asap and have them faxed to surgeons office. I did that 2 days ago...all labs came out normal...now the surgeons office is saying I am losing weight on target...big contradiction...and this has nothing to do with my fast weightloss...My doctor here in town is furious with them and so am I. I am at a loss on what could be causing this problem. Has anyone else suffered from dizzyness? I get all my protein in, take all my vitamins, drink more than I need for water, exercise daily etc. Any help/ideas on what I can do would be appreciated. Thank you all.

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