What are some methods to deal with disappointment in the workplace

Manage your thoughts and emotions.
Dealing with any difficult situation can be tricky esp. when your judgement is clouded by strong emotions and unruly thoughts. Your strong emotional reaction can be disproportionate to the situation at hand so it is important to stop yourself from making any important decisions at that point or even to take action on your feelings.
Take a few hours or a few days before you reach a calmer state of mind; when you do, only then should you act.

Don’t take it as a personal attack.
Don’t take criticism on your work as a criticism on your capabilities and potential. When you work on something very closely you treat it like your baby and any comment or criticism is all too readily attributed as a personal attack. When you take something personally, it unnecessarily narrows your point of view and prevents you from thinking logically.
It is best to distance yourself from the stimulus for a while. Take a break; that way a real understanding of an event arises.

Re-evaluate and Re-adjust.
An objective evaluation of the situation sometimes makes you realize that your expectations may have been unrealistic. So, it is best to adjust your thinking and your expectations with the new reality. Don’t fall into the trap of regrets and guilt. See to the future and decide on an action plan.

Think of the big picture.
Distancing yourself from the situation that’s causing you trouble for a while can be healthy. It doesn’t mean you’re a coward or a quitter. It just means your wise enough to know when to stop and think. Upon thinking and taking some time off you’ll realize how to deal with the situation and secondly, a way to move forward and past the disappointment.

Try again or try another tactic.
Once you accept that whatever happened is done and it’s time to move ahead. You have two simple choices either to try again if you believe it’s possible to succeed by giving it another shot then go ahead and do it. But it is always wise to plan a new course of action by using a better tactic-learned from experience.

But the last most important thing is to not let your disappointments and failures get to your heart. Always use them as a step to climb higher and a motivation to try even harder to reach your goals.

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