What causes orthostatic hypotension when you have normal labs?

I'm 9 months post-op and I was feeling great except for these near-fainting spells when I stood up. I had lots of energy but these episodes continued and became more frequent. Now I'm severely fatigued and I can hardly stand up some times. I get shaky and weak every few days, so weak I can't even hold a glass of water. I have to go lay down for a while. My lab work is all good, I'm not dehydrated, I'm not pregnant, I'm not anemic. What's causing this??? The doc is stumped, too!

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