Hi,
I have had this exact same symptom and very distressing. I found nothing I could do but just let it happen and try to distract self. I only had episodes of it however and don't always feel like this so try to remember it will be over at some point - you will have been through a whole day without it and suddenly remember and that will give you hope. It is not your fault - just another symptom of anxiety that, as the illness is treated/takes its course will gradually lessen.