You are totally normal and far from alone. My horse related anxiety ranges from barely noticeable to couldn’t even sit on my horse for months, even with somebody leading me on a lead line.
You’ve been given excellent advice. I will only add a couple of things:
#1. Keep showing up. Don’t disappear from the barn because the longer you do, the harder it gets to go back. Make your only goal that you will walk into the barn, greet your horse at its stall door and pat it / give it a treat. When you do that, you’ve been successful. Mission accomplished.
Now, if you feel like staying and doing more like cleaning tack, watching lessons, grooming, lingering, hand walking, or riding, that’s gravy. But don’t put any pressure on yourself that you HAVE to do any of those things, because you already achieved your goal.
When doing just that enough times makes you stop dreading going to the barn, make a new goal. And again it can be baby steps, depending on your comfort. Maybe it’s bringing your horse out into the cross ties. You decide what the next tiny step is. You are in control of that, which is important to remember when we have an accident or situation we couldn’t control.
#2 definitely try a few sessions with a counsellor or psychologist experienced in PTSD or trauma related anxiety, because that’s pretty much what you’re going through. Don’t minimize how traumatic the incident felt to you just because you weren’t physically badly hurt. That doesn’t make your feelings any less valid because the trauma and fear are real. The risk is real and you’ve uncovered a real vulnerability. That can be terrifying to recognize, especially if you have other people who depend on you.
You’ll get through this, I’m sure, but professional help really does help! Please keep us posted on your progress.