For whatever reason I've noticed that doing some kind of creative project has a subtle but worth it way of lifting a person out of emotional funk. Making music can help too, even if you're simply sitting down at a piano.
It depends on how your brain works, but there should be a way to direct those feelings into something else for the time being, if the cause is physiological. It doesn't take it away, but it can have a softening effect.
This thread is actually posted in the hair coloring forum Wasn't sure if you noticed!