I'm a little strange in this. I like to dedicate specific time for me to release unwanted feelings. If I'm feeling angry about something, I can't bottle it up for too long or else it wears me down more and more as the day or week goes on, to the point where I practically crack from pressure after a few days. Very unhealthy. So when I get home from work, if it's really bad, I feel best when I'm putting pressure on something, usually with my teeth like biting. So I'll bite my pillow as hard as I want, or I'll squeeze it with a death hug. (After that I usually spend five minutes apologizing profusely to my abused pillow... No joke. But it makes me feel better.)
If force and pressure doesn't help, I'll schedule a regular daily shower that I dedicate solely to releasing old feelings. Standing under the hot water and imagining that the water dripping down me is carrying away all that negativity or anger, like it's melting and dripping off my body. It's sort of a form of meditation, and it's a much healthier way to release. If I ever let my anger show, somebody usually ends up unnecessarily hurt emotionally, typically my wife because she is so empathic with me. So to avoid that I push my feelings back until I can release them on schedule.
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~Lu