Thank you so much! My mother and I run a therapeutic horsemanship program and I have considered being led around the ring, as well as having side-walkers until I can learn to cope with these symptoms. Fingers crossed!
DCG, you have been given tons of excellent advice here and lots to think about. Certainly, if you feel you absolutely must ride again, that which you wrote above, just might be the only way you will ever ride again. I'm sure it is not what you want to hear, but it just might be. And of course, better than never being able to get up on horseback again. If your condition does improve in time, then you might be able to ride without side-walkers. This, even though you might not be able to leave the safety of an arena with people close by to help, if you find yourself in trouble.
By what you say though, I don't think you'll be able to ride out on trails etc., for some time. Maybe months. Maybe years. Maybe never. Don't give up hope, but don't hope for too much. Take it one day at a time and don't push yourself too fast. Patience is the word here, I think.
What happens if you can never ride again? Well it has happened to millions, I'm quite sure. I have not been able to ride for years, because of my back. So what do you do? Well you put your efforts into other horse-related activities. Your therapeutic programme obviously keeps you and the family, very involved.
Keep a journal about your accidents and riding problems, from beginning to end. Who knows, one day it might turn into a valuable book for others, who have suffered similarly.
Good luck and do keep us posted. I know we all here, wish you well.