When I am overwhelmed, wether be sensory or emotionally I tend to cry against my will. It’s good to release those emotions but I totally understand not wanting to do so in public. I usually excuse myself to the restroom to “freshen up” or out to my car and sit for a bit until I can collect myself. Be sure to take care of yourself while doing so, maybe some lavender lotion or a yummy snack or a jam sesh to your favorite song. Whatever it may be, crying is not a bad thing. Taking care of yourself is the most important part.