For 11 days I have had persistent lightheadedness accompanied by mild headache nausea, hot flashes and chills, shakes and a bitter taste. It's like carsickness and hypoglycemia and eating something helps but not always and it continues between meals. It seems to come on when my stomach is empty. It's the kind of feeling I had my entire first trimester of my pregnancies, but I am sixty one now! On day one and today it was bad enough to cause vomiting. Lying down and covering my eyes helps with the nausea. Also having very frequent but mild belching. Otherwise, digestive and bowel systems seem normal.