Exercise used to be my best but i'm struggling with that at the moment cos of the heat and the pregnancy (I'm 21 weeks and have been really tired at night when it gets cool enough to exercise) I usually go for long walks with the dog.
I, like Eskielover, often go to sleep if that's whats needed - if I'm getting overly upset about something and need to get away from it - haven't needed to do that in a while but it works well.
Journalling works well for me if I'm anxious or obsessing over things - it helps me process what I'm dealing with. I don't journal regularly anymore but definitely if something is worrying me.
I try to schedule something for each day to keep busy and keep in contact with other people.