Competing senses. Hot showers, cold drinks. Cold swims, hot drinks. That kind of thing.
Stacking up full body & point sensory things that conflict, because sensory neurons have a maximum load capacity. Trauma surgeons do it sometimes with pain, when there aren’t pain meds around, because pain nerves work the same way. Only so much information can flow to the brain at the same time, so you can numb certain kinds of pain, your brain literally stops feeling it, because the nerves transmitting the info are log jammed. <<< This is ALSO one of the foundarions of self harm, and why it’s so hard for people to stop / it becomes addictive. >>> Doing it with sensory stuff, instead of pain? Just as effective but waaaaaaaaaaay healthier.
The only real downside is that it takes longer and you have to get more nerves involved. Hence why I like to do the shower/drink combo. Full body + the conflict = same area as where the razor clawed vice that is pretending to be my heart is located.
One of the other benefits of water is that it washes away the stink (pheromones, even if you can’t smell them consciously) of your own anxiety/fear/rage, which helps backing off from those things easier. Failing total immersion, strong smells can also help mask those scents, and make it easier to calm.
Something useful to know when playing with your nerves is that fingertips and your lips/tip of the tongue have some of the most. If you have rosary beads or sandalwood prayer beads or similar that you can roll between your finger tips, whilst talking or drinking through a straw or similar? Also helps.