My Fur baby, Bailey

My little fur baby Bailey is undergoing surgery right now for a blocked Gall bladder. Bailey has been ill for approx 10 days, had blood tests, scans and overnight stays with my vet and the emergency vets. He was referred to Chestergates today for further investigations as they could not confirm his full condition, I have pet insurance in place but just don’t have a plan adequate enough for what this will cost. Bailey is only 8 years old He also has pancreatitis, an enlarged Liver which gave a reading of 1000 when it should be 78.  The surgeon advised his Gall bladder was showing signs of bursting... This breaks my heart he is everything to me.  I am asking for help to pay for the operation. I am short by approx £4,500, please help with anything you can. I really appreciate everything