Anxiety killing my ability to maintain an erection

This has been an on and off issue throughout my life but the current bout with this has been by far the worst. I physically feel the anxiety all through my body and extremities and when I feel that way it’s not a matter of if but when am I going to lose my erection. I’m just searching for a way to calm myself down without medication. There’s obviously much more to the story than I’m laying out here but any advice you guys have would be great. My fiancé and I have amazing sex when I’m “me” but while dealing with this my fear of being unsatisfying to her is just eating me alive.