Finding a way to get away, to the restroom for example, can help.

Also, practicing relaxation exercises gives you the ability to apply some of the methods at any time and any place. You could do this while removed to the restroom or even just while you are in the midst of the chaos. It's helpful to be able to shift your focus away from the chaos around you to your inner being, just focusing on your breathing. In....Out....(Some say on the inhale "I am" and on the exhale "Calm" or something similar. Very calming.

Chaos and noise really bothers me too. Generally I avoid it but of course you can't always. (At one time my closest friend was a neighbor with 7 kids! Always chaos there--fun chaos but still I could only take so much. I would have to go, make my excuse and she would often say with a hearty "Had enough, huh?! )
I'm also hard of hearing (which may be an additional reson for my not being able to deal with noise and chaos, as my wolrd is generally very quiet) and I wear a hearing aid so I am fortunate that I can often simply reach up and turn down or off the hearing aid, muffling the sound and thereby diminishing the feeling of chaos too.
Sky's advice to get earplugs is a great idea to try.

I hope you find what helps you!