QUADRUPLE BYPASS SURGERY COMPLICATIONS

MY FATHER HAD QUAD. BYPASS HEART SURGERY ABOUT A MONT AGO. HE WAS SENT HOME AFTER 1 1/2 WEEK(S).  HIS VA NURSE CAME TO VISIT ON THE 3RD DAY AND FOUND HIS SUGAR AT 530 AND HIS BLOOD PRESSURE DROPPING.  HE WAS RUSHED TO THE ER WERE THEY DETERMINED HE HAD FLUID AROUND THE HEART AND LUNGS.  HE HAD TO GO BACK TO THE OR TO GET A CHEST TUBE PUT IN, AFTER A WEEK IT WAS TAKEN OUT BECAUSE IT STOPPED DRAINING. IN THE MEANWHILE WE WERE TOLD HE HAD DEVELOP AN INFECTION AND THAT'S HE HAD FLUID BUILD UP.  TWO OF THE TUBES WERE TAKEN OUT AND IN THAT PROCESS, WE WERE TOLD THE MUSCLE TISSUE AROUND HIS STERNUM WAS NOT CLOSING PROPERLY AND THAT IT WAS STILL INFECTED.  HE HAS A SWOLLEN TONGUE AND CANNOT EAT, SO A FEEDING TUBE WAS PUT IN. YESTERDAY, I WAS TOLD HE IS FILLING BACK UP WITH FLUID AND THEY DONT KNOW WHAT IS CAUSING THIS REBUILD UP.  THEY ALSO SAID HE MAY NEED SURGERY TO RELEASE THE FLUID, A STOMACH FEEDING TUBE IS ALSO GETTING PUT IN.  TODAY, THEY SAY THEY THINK THE FLUID IS BEING DEVELOPED FROM THE LIVER. CAN YOU PLEASE HELP ME?  I NO LONGER KNOW WHAT TO DO. DO THE DOCTORS NOT KNOW WHAT THEY ARE DOING? IS HE A GUINEA PIG? IS MY DAD GOING TO DIE?