Dear Poor:
Unless you're in relationships with unusually tough people, a few lessons at your local church of Asmodeus should be enough to teach you how to apply healing-efficient pain in sufficient quantity that most people will try to avoid it. If you want to hurt people much worse than that, you need to be rich, and if you're not rich, you don't deserve to be happy.
However, if your goal is just to create pain and suffering in the Material - well, first of all, I remind you that Asmodeans hurt people for reasons, and this is what distinguishes us from Kuthites. But if you're looking to cause more suffering in a properly Lawful Evil context for reasons of personal life satisfaction, have you considered becoming a surly clerk?