Concentrate on work when you have personal problems..
grandalf: I have found that things can be distracting when you don't really have a strategy for dealing with them and have not taken any action on that strategy.  So:Step 1:  Come up with a strategy (a bunch of steps to take to address the problem)...Step 2:  Take action on at least one of the steps.  The more steps you take action on, the better you will feel.Step 3:  Vigorous exercise and plenty of sleep.