So maybe you aren't ready to let go of your anger...that's okay. Just use it to propel you forward and AWAY, towards happy and away from REGRET. It may take some time, but it will dissipate...if you let it...go.
My RAD was a heroin addict in my home and I didn't see it, didn't know. I can spend time beating myself up over that--5 years ago...now that kind of anger doesn't do anything but make me feel bad. I had to let it go.