start training yourself to grab something at the first sign- something like a tiny stuffed animal in your pocket, or a polished stone, something with a scent; anything that helps to bring you back to your reality; learn to repeat your name, age, the current date, the president - these things are all reality making. Start when you're not panicking so that when you do panic, it's right there; the things you tell yourself, the object (non-harming) to hold on to. Even if you can hang on to your desk until it passes (which will keep your hands from scratching you). Doodle something that means safety to you - man I did that all through college. As soon as my mind started spinning, I started doodling the thing that meant safety to me.
best!