You deserve the break and you don't owe an explanation to anybody. I work as a welder in construction and the term “mental health day” doesn't really exist. The past 5 years, I take a random day off every once in a while. Some guys like to yap off blah, blah blah. Screw em, its my life and in no way should I just be expected to work a minimum of 5 or 6 days a week, every week with no end it sight. TAKE A DAY OFF AND JUST SIT AROUND AND RELAX.