I am feeling nauseated and weak after eating most meals. I am wondering if it has anything to do with the plethora of supplements and vitamins I am taking from a naturopath. I have been having extreme bloating, stomach pain, back pain, and light headedness for a few months. I have had 3 positive occult blood tests. I have a gastroenterologist appointment on the 16th of May. But now since I am getting nauseated and weak after meals, I am wondering why! I am 23, weigh 176, 5'3" and am female.