Even if the doctor says that you don't "need" physical therapy, I'd highly recommend it. They can help a great deal, and while your body tells you a lot you need to know about whether or not you should do something, a physical therapist will be able to tell you when its a good idea to push past it a little, and get things moving, and when to rest up so you don't damage anything any worse than it was from the accident. I did physical therapy for my shoulder and knee, and while I still have issues, and ultimately quit doing the therapy, it really did help improve my range of motion, and teach me what pain is a "don't do any more" and which pain is a "its stretching out properly so just go slowly".
Just something I do with any horse I have, I always teach them (and of course practice for myself) mounting from both sides, and dismounting from both sides, so if I ever have a problem, and need to do the opposite of "normal", neither the horse nor I are fazed at all. I also put the saddle on from the opposite side as well sometimes, just so its not a new thing to them, and if I ever have someone come riding that does things "wrong", its not a huge deal, I just show them the correct way, and there's no drama. Sending you wishes for complete recovery, and I hope for the best news sooner rather than later.
You never mentioned, was your horse okay after spooking on the concrete?