I was expecting some mental exercise for me which could help me to lower my anxiety and give a mental relief.
I am sorry you were unhappy with your answer.
You can try to use deep breathing/ muscle relaxation to help reduce your anxiety. Here are instructions on how to perform the exercises:
You can also practice distraction to help you cope with what you feel.
It helps as well when you find yourself feeling upset to find an object or thought that you can focus on. For example, if you choose an object, look at it and focus on the details. What is the shape, color, distinguishing marks, etc? See how much detail you can pick out. You will find when you do this that your bad thoughts recede and you feel better.