Light headed/dizzy spells

Anybody else having lightheaded/dizzy spells? I have them every time I stand up from a seated position or lift my head from looking down or picking something up. Before you all yell at me to run , not walk, to the nearest doctor, I have already discussed with both my surgeon & PCP. They call it postural hypotension (low blood pressure related to posture changes). My blood pressure has been hovering around 102/59 --kind of low, but even at 255 (pre-op) it was around 120/65. They say there is nothing I can do, except change postions slowly, and both suspect that my body is simply adjusting to a 75lb weight loss. Just wondering if anybody else was experienceing this, and whether you have any suggestions. Oh and to answer a few inquiries--I take my vitamins daily, get in 60-80 oz H2O daily, get in all of my protein & don't drink alcohol, carbonation or smoke. I also have 1 acheiv one protein drink daily, but otherwise have no caffeine. The docs both said that low fluid intake can cause the lightheade/dizzy episodes, but that they would be more random and not associated with position changes. Thanks for your input! Have a great Saturday. R. Sperry