Help My Kitty Get His Ninth Life!

This is my cat, William.
He is four years old, and I've had him since he was born. Unfortunately, William has bladder stones- little solid granules that build up in his bladder like a kidney stone or gallstone, and block him from urinating. It is very painful and can happen very suddenly. One day he was fine, and next, he was extremely sick. 

Unfortunately, my mother and I are completely broke and we have no money to get him the treatment he needs. He would require a surgery to remove the stones, a few days at the vet with a catheter, and then a special kind of food to keep the stones from forming again. The surgery alone costs over two thousand dollars. That is why I have turned to gofundme in an effort to get my kitty the help that he needs.

I don't know how much longer he has, or if we'll even be able to get him to the vet on time. If he does pass away before then, the money raised here will go to helping his sister, Bella: 
who is beginning to suffer from the same problem. 

Every little bit helps- a dollar, five dollars, ten dollars. I would be grateful for every penny. Please help my kitty get a second chance at life.