As explained above, deja vu is a symptom, not the illness itself. You need to discuss all of your symptoms that you just described here with your personal physician. Memory loss, fatigue, nausea, dizziness, headache, etc., are symptoms that should not be dismissed, and could indicate a serious health problem. Please contact your physician promptly. If you experience the symptoms again before you can get to a scheduled appointment, you should seek emergency treatment...the best chance of making a definitive diagnosis will be to have an examination while experiencing the symptoms you're describing.