Hi!
I rescued a beardie in a similar situation back in August. He was missing his front arm (above his "elbow"), the stub still bleeding, was missing toes, had a very stubbed tail (missing upwards of 2.5 inches!), and a bloody face. He was also very thin and emaciated. At first he ate well, but then he went off his food for a few weeks. I was able to force feed him, and eventually he started eating again on his own. He has since gained 150 grams, and grown several inches. His face wounds have healed, and his stub wound also has.
How are you doing with the feeding? Is he gaining weight? If you think that he is getting enough food, you could just continue doing what you are doing and he will most likely start eating on his own eventually. He might be too weak or hurt to catch food right now, maybe due to the swollen stub (keep an eye on that!). Also, what are you giving him? If you are feeding him crickets, try switching to something that's easier to catch, like worms or pellets. You could try soft pellets if he can't eat the hard dry ones. A warm
bath for 15 minutes several times per week might encourage him to eat and will help with any dehydration.
If you feel that he isn't getting enough food, you can try using baby food. I had to feed one of mine baby food for a while once when she had a respiratory infection (not the rescue). If you decided to do that, you would give him chicken baby food meant for the earliest stages (that type is the thinnest and is easier to put in a syringe and easier to digest), and some butternut squash baby food also earlier stages. Adjust the amounts according to his age (more protein if he's younger, less if older) and the milliliters according to weight (use common sense, and at the beginning, start out with a small amount to avoid shock). I would use an oral syringe (no needle!). To get the food in, you could put some on his snout to see if he starts licking and then slowly squeeze it into his mouth, or you could try prying his mouth open carefully. Make sure to use a plastic syringe, not a glass one. They sometimes bite the tips off. Inspect the tip with each use. The tip will get chewed up quickly if you're putting it into his mouth, and you wouldn't want him to swallow it. You can get syringes at any pharmacy for free. Just ask for one. I'd recommend getting a 5ml syringe, no needle.
As for his stress level, try to put him in the quietest room in the house, away from any other beardies, and try not to handle him for anything other than necessity. Do you have a picture of him? It would help me evaluate his condition.
Good luck!
