Let's say you are a surgeon, and suddenly you start worrying about your hands shaking during a surgery. When not worrying about it, your hands are very steady.

Next time you are in a surgery, your hands indeed start shaking due to worrying about it.

Now you're even more worried because your worry became true. You know this is 100% psychosomatic, but that doesn't help the fact that it physically made your hands shake.

They say that exposure therapy helps with fears, but if you constantly have bad experiences where you are unable to perform surgeries due to shaky hands, doesn't that just enforce the fear?

If you fear something, and the fear doesn't become real enough times and you have positive experiences, then I would imagine the worrying ceases.

But how do get over a worry that you know is 100% from anxiety i.e. "not real", but oftentimes becomes reality?

Obviously, if you manage to reduce your anxiety to a healthy level (anxiety is not a disease by itself, but an emotion), that would mean you wouldn't worry about such things. But in the short-term, if your anxiety is still higher than necessary, how do you move past such worries?

This was just an extreme example, but can be applied to many different psychosomatic symptoms.