I have experienced this for years. It came to a point where I knew I needed to address it. The first step in doing so was saying NO to social commitments that I did not want to go to (instead of saying yes, having to cancel, and feeling anxious due to that).
It has helped – my anxiety is still terrible, but not nearly as bad as it used to be when I said yes to every plan that presented itself, and I found myself with nightly plans every day of the week.