My fistula was doing well. I was using it with one needle when it suddenly quite working. I am off my coumadine (blood thinner) due to having a neph tube put in to drain my kidney. I got a bad case of the flu and spent a day laying in bed and throwing up. Then yesterday at dialysis the fistula wasn't working! They got my an appointment to get it taken care of tomorrow. I thought they had to be worked on within 24 hours? How bad will it hurt? How sick will I be afterwards? This will be my fourth little surgery in three weeks and I am tired of pain and being sick!