I have low blood pressure, and have been very lightheaded- almost fainting lately...

I know my symptoms are because of low blood pressure. I have been feeling quite dizzy and lightheaded lately. I almost fainted before and my vision like went black for a second, and after eating protein and drinking water and trying salt, still didn't help that much. Just wondering if others are having the same problem. I think I might have low blood sugar, too, I don't know. I exercise 5 times a week and get weak or lightheaded after that sometimes, so I try to eat protein with carbs. I drink atleast 80oz of water a day, usually more. I also had ulcer surgery to repair a perforation 2 1/2 months ago, my BP then was like 80/50. I know it raised some for a month after, maybe to a low/normal BP, but I think it must be lower again. Any input would help me alot- thanks!

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