Rinah20: there may be something else totally unrelated to these discussions going on. Do you notice that lightheadedness seem to follow after you quickly move from a seated/laying position to a standing? When it occurs while standing are you still, or does it help to move, like just shifting your weight from one side to the other?

If you find the above applies to you, you might ask your doctor to request a tilt-table test. I may be wrong, but it’s worth looking into, and could resolve some of your issues.

Howard