It's very difficult for people to understand, unless they have been there themselves.
Sometimes we have the extra patience and energy to kindly, patiently try to educate others into an understanding.
Other times we need to give our emotions an outlet, a voice.
There's nothing wrong with anger. Anger has now surfaced. The fact that you can feel it, recognize it, and write about it -- is likely symptomatic of some personal growth!
Celebrate your anger!

WC