What Does Twitching Sensation Around The Eyes Indicate?

I was once diagnosed with a muscular disorder myasthenia gravis in 1993. Lucky for me lifestyle, diet, meditation, detoxing my body, chelation therapy a great doctor like Dr Perlmutter and Ayurvedic therapy rid me of this issue. I was diagnosed immediatly after symptom appeared and my regular GP doctor realized I must have flooded my body with mercury the year before having had all the mercury removed from my fillings which was ahead of the times and done with little regard of the dangers of safe mercury removal as is done today. After 24 years I am fine with no side effects. I do take a number of supplements, exercise, Yoga, meditate, eat organic foods and stay away from packaged foods, sodas etc. I started taking huperzine A 200mcg s in the AM. just recently because of age-related precaution to Alzheimers since my mother dies of it at 69. I am 70 and am in fine health but precautious. So I notice after I taking the Huperzine A I am getting twitching in my eye areas and feel tired in the afternoon. So is this good for me given having been diagnosed with MG in the past