Duality Options

What attitude should I have toward duality? It has long been a question in my mind.
I've try to meditate on this topic and finally accept the idea of "Good is evil ; Evil is good."

I try to embrace both the light and the dark. Problems came here.
When I heard the others' malice words, saw some "improper act", I force myself to stop criticising and resisting but embrace them, but headache had develeped whenever I do that, I can feel the "negative thoughts" fogging and causing the pain inside my head . A week ago, I even got a fever /_\ . I made effort to 'produce' some positive emotion, I felt both happy and woe at the same time, sound weird? Now, I just stop awaring of the thoughts and feel better now. However, I want to confront the idea of duality. Could you guys give me some advises and your point of view over duality ?

My learning process is also affected, as my strifing toward my goals, doing meditations, during rituals, the opposite results ' pop out' , annoying and distucbing me. If I do the same way and accept it, I will fail.And if I accept that fail means success, I will fail ! What should I do ?

And I heard that, the world is in equilibrium, because there are the good and the evil are balancing each other.If I develop myself totally toward the good side, will there be anything evil opposing aginst it in my own system? Also, I wanna ask, is that mean the god is satan? or satan is only an aspect of god ? As the god is everything.

The chaos is really deranging (IMG:style_emoticons/default/laugh.gif)
Okay, I'll try on that one and hopefully it can correct my concepts.