First of all, “fighting your inner urges” won’t make you bipolar. That is a biomedical condition caused by imbalances of neurochemicals. You can’t influence them by thought alone.
Have you stopped to consider that if everyone lived out their lives following their inner urges, the streets would be littered with corpses?
No, we are to discipline our impulses with thought and reason, and yes, the tools of our faith. You needn’t look as if you are talking to yourself. Learn to discern how impulsive actions would displease God, harm others, and harm yourself, and dismiss these impulses as leading you towards a bad course of action. Even if you doubt that the actions would be offensive to God, they most certainly would not even be in keeping with your own self-interest.
It would be tempting, and somewhat satisfying, to tailgate the guy who cut you off in rush hour traffic, flip him off, flash your car’s headlights at him, and lean on the horn. But honestly, what would that even obtain for you? Certainly the knowledge that you were acting in an asinine manner, and if you were unlucky, a traffic ticket, and if you were really unfortunate, an accident. Isn’t it really in your own best interest to let the affront of getting cut off in traffic slide?
Aren’t most of the things we do based on our feelings at the time really short-sighted?
Learn to cultivate your reason and will to combat impulsiveness. You therefore are not at war with yourself, you are merely nurturing your better self.