You're right about anxiety,it's had been a major problem in my professional chess career,i tend to be anxious to beat a more superior opponent,most times in a bad position on the chessboard i worry about how the incoming loss would affect me,emotionally it swindles me,and sometimes i end up winning.Like you said and i agree;

Maybe we are not meant to eliminate anxiety ever, but we can learn to keep it at bay almost always...

Thanks alot sir.