2 1/2 days of sudden onset of strange smell, dizziness, and nausea, and overall tingling feeling and mild headache. last about 2-3 minutes. 2 to 3 times per day. on the first day slept on and off about 18 hours. second day better, but returned some today. no diarrhea. not related to diet. I have had two colds since Christmas, the first a head cold the second more of a chest cold and mostly recovered from the colds. i m 67yo no chronic health problems. annual physical and lab work 5 months ago all normal.