Lightheadedness; A Couple Of Times, Almost To Fainting. The Worse

Lightheadedness; a couple of times, almost to fainting. The worse episodes was upon getting up in the morning. Very tired. BP is norm at 128/72. Blood pressure med is Valsartan HCT. Poor eating habits; can go 8 hrs. or more without eating and the only thing that I was drinking was sweet iced tea caffeinated. I have limited my tea to half sweet half un-sweet and only 1 glass in the mornings. Overweight; can't lose weight. Urinalysis was good; not an anemic. The back of my neck hurts; had X-ray; slight arthritis showed up. Brain MRI, all negative. Wore heart monitor for 24 hours; all negative for any problems.