Emergency Surgery for Thomas the Cat

I have no idea what happened to Thomas but his paw is severely injured and requires emergency surgery.    He came as a stray 5 years ago with a broken back leg so I took him in and got him to the vet and they had to amputate his leg so he only      has one back leg and that is the one that is injured.   

I am a single parent to a 3 year old with profound autism who is non verbal and currently requires even more care as she has an NG Feeding tube.   I haven´t worked for 3 years since she was born at 22 weeks gestation weighing only 1 lb.   Her needs far exceed what any daycare provider is willing/able to provide.   

We live off of $780 a month so there is never extra money for emergencies.   This is an emergency and he is family.   Please consider helping me NOT have to euthanize him because of money.