I'd say that's more akin to a case of the blues - the loss of interest in hobbies/activities, the lethargy, and the negativity - rather than just regular boredom, of which everyone gets that way every now and then. When I get down on myself I try occupy my time in spite of my mood, which usually goes a decent way in helping me forget whatever tizzy I'm in.
So I don't know, the best remedy is time and some good ol' escapism?