Agressive vs anxious: how it affects your chess ?

You deal with an opponent, you are in your finale, it goes well: an extra rook and an extra fool. Sounds like it is done. And all the sudden, opponent pushes his last rook and you get yours away. And you lose two moves later. When reviewing the match, you suddenly realize you could have taken that rook ! What happended ? 

Some people just tend to flight more than to fight, as a deep way of thinking. Anger is the emotion designed to face a situation that bullies you. Body answers by pushing muscles into an effort to come. I am not saying you should hit a table as soon as it happens, but it is a body choice, and generally a good one. Anxiety is too. And the one that wins will decide if you flee or fight. Pay attention, I am not a psychologist at all, this is just a personal understanding. In terms of chess, it may mean a general tendency to consider moving over attacking, on average. But it is a body response that may be overriden by taking a deep breath and applying a questioning, as a reflex: 

• Am I threatened ? Yes, by this current piece or combo 
• My options are .... What ? Taking that piece ? Possible. Leaving ? Possible, to go where ? 

My point is that anyone may learn to apply a method to fight a tendency, at least in chess. Just looking at the board and taking the time to find all the options. To understand why that move ? Is it a desperate "all in" move from the opponent ? Or some tricky move ? If you feel anxious, you likely overestimate your opponent and underestimate yourself. Take the time to take a deep breath. Then, after practice, it will be like a reflex to consider the board and play the board, not your emotions