I fractured 3 and cracked one transverse processes in my back from a fall from my horse. Its almost 2 years this month. It didn't require surgery, its one of those things that just has to heal itself. I can still occasionally feel the little bones shift around.
I was off of riding for only 3 months. Then it was getting over the anxiety of falling. I'm fully "back in the saddle" now
Do what ever it takes to get healthy and count your blessings it wasn't worse. I don't know the full extent of your injuries but please, do what the doctors tell you. Maybe get into driving like bubblegum if you must have horses in your life.