The best indicator of a person's level of optimism is his or her:

The best indicator of a person's level of optimism is his or her attributional style.
Attributional style is a term which refers to how you explain the causes of some events. For example, something bad happens - and based on whether you find the cause to be your own fault (negative cause) or tend to see a brighter side in it (positive), your level of optimism can be measured, which is related to your attributional style. 

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.