Brooding is very unhealthy.
It perpetuates your loss of temper and can lead to an unpleasant outburst at a later time.
You will over-react to a minor irritation.
You may be snappy or curt, off-hand or abrupt.
The thing to remember about brooding is that other people can see that you are brooding.
The surliness is not a secret.
It is far healthier to talk about whatever is troubling you.
Attempt to broach the subject gently and tactfully, without sounding opinionated or judgemental.