Quote Originally Posted by Reggie
You need to take him to your nearest rodent vet IMMEDIENTLY! I think that Petsmart/Banfield can care for rodents. Contact them for more infomation. All my thoughts and hopes for your bun!
Rabbits aren't rodents. Where abouts are you located? Maybe there is a close rabbit savvy vet to take him to or like you said take him to the rescue you got him from.

I hope he starts feeling better soon.