After the end of today's work, the feeling in my mind and body was really strange. I probably was really tired then, and hesitated to utter so, but my behavior indicated much worse message, giving at least 10 passengers uncomfortable feeling. I'm sorry about that. On the train, I felt as if I was flying in the air while standing, and thinking that "have I already been dead?". 5 minutes after three seat became free, two sat and one seat left free, but it was not until the train arrived at the next station and stopped that I managed to take an action to have a seat. I had been feeling that I was so unsettled that when I bent my knees to sit down while running, my entire leg would get tense, stiff and fall on the ground instead of having a seat. I'm writing this. This means I was finally alive, and all I experienced on the train this evening was a serious panic from mental tiredness and anxiety I daily hold from day to day.