Can we say whiskey can make a person relax mentally for some time as its positive effect especially to a person who is experiencing mental trauma.

Avoid alcohol. Alcohol is a depressant and interferes with coping ability unless use is minimal. If you are suffering from stress, alcohol as a treatment is a terrible idea! It leads to abuse and worsening of the stress. Your best bet, is a full physical by your doc, with appropriate testing, to be sure you don't have something physically wrong that affects your ability to cope, then get referral to Psych.