Stimming is a sign that you need something super happy to spike your dopamine during times of great stress.
If you're stimming that much, it means you need it. There must be something really overwhelming you.
Here are a few things that I do when I'm out of the house and my body suddenly needs a dopamine rush, due to overstimulation or fear:
You should see me in my wheelchair. If I'm stressed out, scared, or overwhelmed, I pace back and forth in my wheelchair.
I don't realize there's anything wrong, until I look up and see people staring at the weird lady, wondering why she's going up and down the sidewalk. When really, if I were able bodied, I'd simply be pacing.
Also I bring some kind of yarn project with me most places. Keeping my hands moving, the smooth roughness of yarn, and the act of creating something new, helps regulate thought for me.
If I forget yarn, there's this really great Facebook game that I play on my phone called Connect the Dots. It involves a lot of decoding and deep thought. It helps me be able to relax and think clearly about things.
It's a great game for sensory emergencies. Here's the link for connect the dots:
Facebook
If I don't have enough data on my phone to play that, I keep a fidget spinner and simple dimple inside my purse for emergency stims.
So the stimming isn't the thing that needs surpressing. It's the life events that overwhelm, that your body physically needs to work through.
If you don't stim, you might have worsening autism symptoms. So just have something to stim with, at all times.