Do you consider yourself an anxious person, and do you believe this hinders your poker performance? Do you believe that poker results are related to your mental state?
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Whether due to overconfidence or lack of concentration, have you ever lost tournaments because of the impulsiveness?
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Seriously?
Why do you permanently ask rhethorical questions where everyone knows and has an answer?
Is there someone fishing for statistics or something?
And not to be off topic too much:
Yes sure it does for a lot of people and I am sure everybody has lost control over emotions at the table at least once. Be that anxiety or overdexcitement it usually leads to bad results since emotional reactions are not solving problems in a rational and efficient way.
Ask Spock for more.