Hi welcome to Health care magic forum. You are 18 of age, strenuous, weight lifter, and probably with all healthy habits. Your grand father had anurism , and he faced it . It is only a coincidence, and nothing else. Some other member can have some other disease. You wont be prone to all those diseases. Twitching of face and hand may be due to deficiency of calcium, or some other deficiency symptoms like anaemia
It could come under obsesive compulsive neurosis
, or hellusinations. If you feel it difficult to bear you consult a physician to clear your doubts by excluding the possibility of the CNS, and CVS problems. If you find some thing can get it treated, accordingly.
Besides i advise you some diet recommendations as take more of green leafy vegetables, pulses, sprouts, egg , milk, meat, chicken, fish, and other sea foods, fruits juices, and dry fruits. which improve blood, general health, resistance against infections, and stamina to lead power full life. and keeps the hallusinations away. Wishing for a continued health and thanks for calling.