I work as an HVAC technician. And I love my job. Heres the thing; when it comes to the doing some of the hazardous work such as gas piping and venting the flue gases especially for friends (which I am not doing anymore but have jobs in the past that im liable for) I will do the work and then constantly dwell on did I do it right? What if I missed something? Its going to kill someone I have no insurance. Will I go to jail?  This makes me constantly check everything sometimes over 25 times. If I could go back and change careers I would but I cant financially. This applys to other areas of my life. Did i close the door all the way so the dogs wont get out? Did I accidentally bump the stove on? Will my charger combust if i see its touching fabric? Did my cigarette ash go in the back seat and the car will catch fire? Did i put the car fully in park? Did I just run someone over with my car?