I fractured T6 and T8 at a dude ranch in 2009. I just assumed I had pulled some muscles and didn't go to the doc until a month later. Imagine my surprise when the xrays and MRI showed a pretty serious fracture in two places! The pain was getting worse and that is why I finally went to the doc.
By the time we discovered the fractures, they had already begun to heal so I didn't need a brace. A brace would have been difficult anyway since the break was up between my shoulder blades.
The pain was mostly coming from trauma to the tendons and muscles around the factures. I had a series of steroid shots around the spine to help with the healng of those tissues.
My doc told me I couldn't ride until I was pain free.
The accident happened in September. A the end of January I was still in pain but I got on a horse anyway. Just walk...no trot or canter.
My back immediately felt better. It helped relax me and riding seemed to strengthen my back.
My back still hurts every now and then, but mostly when I haven't ridden in a while.
I would never suggest you go against your doctor's orders. Please follow what he asks you to do but for me, I came to the realization that I may never be totally painfree and refused to stay out of the saddle anymore and luckily it worked out in my favor.
Hope you heal fast!