Fear is an emotion veiled, thus fear can be displayed as anger. With your sudden reduction in fear towards your abuser, and now anger instead, it is a positive step, but what you must remember, is that anger is not an emotion, it is actually an effect from emotions.

Maybe one could actually guess, that because you have dealt with your fear, you are releasing your true emotions now as anger. Maybe such emotions could be relief, understanding, remorse of what you have lost in time, etc etc... which are what are now causing your anger. Reducing your anger should not actually make you fear again. Having excessive anger is not a good thing either, and you do need to tap into what your real emotions are that are now stemming your new and improved anger. Relief is probably coming to mind most with me surrounding your circumstances. Relief that you no longer fear your trauma, relief that you no longer fear your abuser, relief that you have come to terms with some of your past.

You know the answer to this already though... it is within your mind, its just a matter of pinning those emotions down, and then accepting them, and ridding the anger component. Maybe it is that you need to break and cry...