I used to have a good friend tell me that even though I was not happy I should just smile any way. Just keep smiling and eventually the emotion will follow. Sort of a fake it til you make it attitude. At first it took a long time to make it, to change my out look or attitude. Now that I have built this muscle of ability to change my attitude regardless of my situation, I am able to shake off just about anything within an hour to a day.
Change your flat tire, change your attitude, smile even if you don’t feel like it and eventually your true light will shine.