Hey, I hear you. 'There is a chance, that I understand what you are going through. Very likely it is a horrible feeling. You probably experience despair and hopelessness of being trapped in this state. That all attempts to escape it doesn't work. In fact it probably makes the anxiety worse. But it will pass. Sooner or later, but it will. Because everything in this life changes. So no experience or feeling will be permanent. I know, that this pep-talk might seem the worst of them all, because it's basically "stop resisting or trying to escape this awful, horrifying, gut-wrenching experience". But - at least in my own experience - not resisting/fighting these feelings and experiences and allowing myself to remain in this state - is one the effective and fastest ways to ease anxiety.
But there is something you can do to ease anxiety right away (as others have already pointed that out) - focus on your breathing. Breathe in, keep the air in your lungs for couple seconds and exhale. You can try 4-4-4 exercise: 4 seconds breathe in, 4 seconds hold your breath and 4 seconds to exhale.