How concerned should I be about episodes of my arms quickly feeling heavy and too weak to lift up. It lasts about a minute, then goes away. I can be doing nothing special, eating, standing, talking, when it happens. I had my 3rd & 4th episode both today. The other two were about one week ago, and about two weeks ago. Other people don t seem to notice anything happening to me and I try to act like it isn t happening just I keep my arms down.