Why don't you try some finger breathing, it's a great way to help you tame nervous beasties of your own.
You can find our breathing exercise cards in The Yeti Shop.
Why don't you have a go at
drawing your own Nervous Beastie?
Or you could ask your grown-up to help you to make a brave book, so you'll have it handy if you ever need to shrink a nervous feeling of your own. (click to print)