First, there is nothing that can stop the overstimulation except for going inside a bubble or box and never coming out --- let's face it, that can not happen.
So, how do you support yourself (body and mind) through the overstimulating feeling?
1. Notice and recognize what makes you feel overstimulated
2. During these moments of overstimulation, notice how you feel
3. After you notice how you feel-- what does your body need?