Hello, i live in Wisconsin, i have a rabbit momma that lives in my backyard, shes been there for the longest! well i'm pretty sure the little rabbit i found is hers but i found him injured, he couldn't move and was trying to drag his legs, there are no visible injuries or blood, he is not a baby rabbit but he is still little, not sure how old.
It's cold outside so i thought i should bring him inside, i tried to feed him, i gave him a carrot and he ate a little bit, i really don't know how to care for him, i wish i knew because i don't want him to die if it's in my hands to save him.
He is inside a box, i put some cloths inside so he can stay warm, his eyes were more opened earlier, now his eyes look really sad

I don't want him to die feeling pain what should i do? how do i give him water? i'm afraid to pick him up again and hurt him, or that he might go into shock because of me. Is there anyone here that lives in Madison that could take care of him? i really don't know of any rehabbers in my city, i don't want to take him to a regular veterinary clinic, last time i did that they didn't do anything for him, they just took him in and left him to die