The tool I've been using to deal with stress has been fairly effective: when I get stressed I ask myself how much responsibility I am taking for a given situation. I then ask myself if I am overstepping my responsibility. (Being OCD, I often do!) I then ask myself how much of a responsibility is ultimately mine, how much is someone elses.
If I know I can handle a responsibility, no problem. I relax and just do it.
If it is a problem I can solve, no problem.
IF IT IS SOMETHING I CAN't SOLVE:::::I am finally learning to accept that.
This thinking is based on the serenity prayer, and has helped me a lot since I quit drinking.