"The inflammation of the lining of the stomach is called gastritis. Dizziness and fatigue after eating meals are common symptoms of gastritis. This condition may be caused by irregularity in eating meals, consuming improperly cooked food, excessive eating of oily foods, overeating, alcohol intake, and drinking strong coffee or tea."Be wary of any health-related information found online. The site itself has no disclaimer, no source of information, and furthermore, not HONCode certified. The best next course of action is to check with a doctor.
-- MD-Health, emphasis added
There are two symptoms of dizziness. One is light-headedness where you feels like fainting. Second is vertigo (which I always thought not a word but a unique name of the imprint of DC Comics, silly me), where you feels the spinning sensation. You can sense the sensation from three sources, objective (world is moving), subjective (the person him/herself is moving), and pseudovertigo (rotation inside your head).