I'm so sorry! About 6 years ago one of my sugar gliders was going through the same thing. I got them from an owner not giving them a proper diet. I'm sad to say that she's never been able to Glide or climb quite the same again, even with the miraculous recovery she had.she has a slightly paralyzed leg but it doesn't bother her and she can still function and play. Just keep giving your glider love and keep him in your prayers!
P.s if he is able to make a recovery and is showing that he is going to survive, after he heals from this incident do a little bit of training with him to get his strength back. Just play with him and give him the option of exercise (like a wheel), make sure they always have a big cage so they can glide if they choose. Let him run around in a safe area with your supervision. Doing this will hopefully help your glider become the happy little fella he's meant to be.