Ever since i was 6 (or the first memory of it) Every so often i all of the sudden feel really weak, then i lose feeling in my legs and hands, then i lose my eye sight, then sometimes i pass up. Now i'm a 19 year old female whose 5 9' and about 145 lbs. and now is gone from every 2 1/2 months to 3 times in the past week, i'm extremely tired all the time, even just walking up stairs. what could be wrong?