Hi, I also have low blood pressure. Staying hydrated is a one of the big ones to keep your blood pressure up. A lot of foods and drinks are diuretics. Stay away from coffee, brown soda, - like coke, green tea, celery, cabbage, etc. You can google to find a bigger list. Also some vitamins can cause fluid loss, like Vitamin C. If you're passing out, you may want to see another Dr. That sounds pretty scarey.
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Al and Kim 
Village of Fernandina
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