So you need a word count and need a bit of help. Let your character go on a rant. It can be anything. Underpaid and overworked. Who ate the last cookie in the jar? Who drank the milk and put back the empty in the fridge?
There must be loads of things that bug you. Be free and say them through your character. Unlease your temper and anger through your character.
Yes that is my tip for today.