If you eat, the mechanical motion will tell your brain that its not under threat. Eat slowly and take all of the time in the world.

I go to my Dojo and practise Zen.

Kill something.

I listen to http://di.fm/chilloutdreams or one of two songs on repeat that really seem to calm me down: karen overton - your loving arms, the doors - riders on the storm. i've also tried listening to ashra.

It depends on what I'm scared about. Once I spot what's making me feel that way I either face it and try to rationalise the fear or I focus on other thing to distract my mind

I like to rewatch a comforting show/movie.

Walking often helps me at any kind of mental problems

I'm always calm on the outside, always chaotic on the inside, this will change when I am dead

I am prone to anxiety and panic attacks myself. When I feel such an episode coming on, I am mindful to stay aware of my current surroundings.

For example, my last panic attack started creeping on me when I was in the car. I took stock of the scenery outside my window and listed everything I could see (in my head). It soon went away again.

I saw this the other day, and am planning to try it. https://www.popsugar.com/fitness/finger-tracing-anxiety-technique-from-psychologist-48313621/amp
Is there anyone with you that can help talk out your fear (s) with you? Someone that can help ground you or even just hug you? I find that close contact with another person who cares for me and/or loves me, helps.

Seek pleasure. Immediately. Distract yourself. It's a matter of turning up the volume to mask ambient noise.