Hi moodycow
Sometimes the only thing that I can do is wait it out. It sounds unhelpful maybe but I know that feelings and emotions are always changing so if I just not act on whatever feeling I am having that is negative then I feel safer. This may not be much help but it is all I know to do.
Some people say to take one day at a time but I try to take one moment at a time. I read meditation books and try to distract myself at times, too by playing games that are mindless!
I hope this helps in some small way.