I can definately relate to that. Especially the part about becoming bored and intolerant of being in the same situation. It caused quite a few problems for a while.
If it's something that is causing some real problems, then asking your doctor about it would be probably be the best solution.
Personally, I couldn't get any help for it medically. But after a while, I found that 'controlled chaos'(if that makes any sense) can be pretty nice in a way. The trick is making sure that you don't let yourself do anything harmful, whether it's financially, medically, or otherwise. So instead of quitting my job when I get bored, I might take off for a weekend to some place I've never been to before, as long as I can afford it. In a way, something like that seems to get it out of my system, and the new experience can be really fun as well.
Now, I'm not suggesting you pack up and fly halfway across the world when you get an urge for something different, but for myself, a short term change of pace or scenery can sometimes be very helpful.