Please help Blu

BLU is usually so full of energy and such a lover. On may 24th he had gotten in the trash and ate a corn cob. The past week me and my family have noticed his health start to decline. He hasn't eaten or had a bowel movement since then. He drinks water but throws it back up. I taken him to banfield pet hospital and hes on iv fluid now waiting for surgery. I dont like asking for help but I can not see him suffer no longer. The surgery is estimated to be 1900. I have to have at least half of it by friday. Any help would be greatly appreciated. Blu is such an amazing pup