I've been taking half the dosage of Xenadrine (1 pill in AM before workout, and 1 in early PM) for a week now and have felt okay except for light-headedness. I feel light-headed for about an hour or two after I take the pill. I've noticed that the light-headed feeling seems to be getting better with each day, but I was wondering if anyone else had experienced this and how long did it last before -- or if -- it got better.