Awe, poor little guy, what a freak thing to have happen. Well, at least you got him some pain medication and something to help get the swelling down, hopefully he will eventually start to recover once the swelling goes down, right now he just needs to heal and stay comfortable. The pain meds he's on are probably pretty strong so yes, he'll be sedated, but he needs them right now while the swelling is bad. As Tracie already mentioned to you, giving him a probiotic along with his medications can help to keep his stomach settled and his bowels moving, because if they gave him any type of opiate pain med they can cause constipation as well, so the probiotic is a must to keep his bowels moving.
<<<< I'm confused .... do the meds the dragon is getting include antibiotics ?
if so why is he getting antibiotics ?
If no antibiotics - I can not see the need for probiotics.
You may want to speak to the reptile vet about getting some Oxbow Critical Care, it's a powder that they give to reptiles that are sick/injured and not eating on their own, and you mix it with water and feed it to him with an oral syringe, it will keep him getting the protein, calories, fat, vitamins, minerals, etc. that he needs so he won't lose any weight while he's going through this, and it will also help him to better heal. They'll definitely know what "Critical Care Food" is, just ask them about it, because I doubt he's going to have much of an appetite for a while until the swelling goes down and his nerves are decompressed.
<<< I concur .... or http://www.vetnpetdirect.com.au/vetafarm_critta_care_reptile?gclid=EAIaIQobChMI1KuuvZHo2AIVHAQqCh1QmwGbEAQYASABEgKnzfD_BwE&gdfms=0FACE03B71074D1E943C7E5665E213C7&gdffi=10600f223f474e1c9ae213f32fb3a662.... this is great stuff and I have had great outcomes using it for very sick lizards (ie Lucky , and then Fluffy).
Another option is http://www.repashy.com.au/index.php?route=product/category&path=59_63
I'm glad that the information I gave you was good information, lol, the lady I spoke to at the rescue in St. Augustine just raved about that place, she kept saying that they were the most knowledgeable place she had ever had a reptile to, so I got a good feeling.