Hypoglycemia is the opposite of diabetes Ð too little sugar in the blood. Its symptoms are: overall fatigue, nervousness, sharp hunger, trembling, rapid heartbeat, dizziness and headache. Unlike diabetes, hypoglycemia is not a chronic disease that requires lifelong care. It is, in fact, correctable by a change in diet or, when it is caused by a diseased organ (such as the liver or pancreas), by treating that part of the body.