Hello I am 66 years old for the past 5 years if I get super stressed or tired I will get shaky enough that I can't hold a cup, My knees give out I can stand, walk or talk after a few hours or a day then I am fine again. My neurologist has no idea. I was in the hospital for three days then I was fine Doctors had no idea. I had an EKG done and I was fine until the test got to the strobe lights then I went into what I call an episode in the middle of the test their answer to the problem was we don't know. I have no idea when it will start or why and I don't know how long it will last. Thank you