As Mark mentioned, our brain needs quite time with less amount of stimulation to get rested.
This is just a suggestion; when you need to somewhere like you have been that day, if you can prepare yourself it could be a little easy on yourself. Like reminding yourself that is maybe a loud and a crowded environment present at that place, plus earplugs as mentioned above.

I guess the biggest thing is getting your attention and focus on something makes you more relaxed.
In my situation, the more rested I am the more i can handle stress. Also the expectation of what can happen where i am located or going to be.
Like if you are walking by a road expect to hear small cars as well as large truck with horns blowing.
Good luck!