I was assigned a task which I failed to complete and when my boss explained it to me I was feeling as dumb as montessori child. All rest of the day I didn't succeed to focus my attention and I didn't do anything. I just wanted to run away from that place. I was feeling like I can't do anything. It felt like my mind fell asleep. I tried to awake it but didn't succeed. I don't understand what that feeling was.... whatever it was, it scared me. If it happened again, my job could be at risk. Just a little mistake shouldn't make a person dumb like that. Any suggestion on how I can control this overwhelming feeling of disappointment? Still my mind isn't able to think properly and I don't know what to do. Suggestions will be greatly appreciated.