My 7 month old Akita Puppy has not eaten since last Thursday evening.. he has been vomiting only..?

He has done all blood work Parvo Ultra sound, Xray and they ar all inconclusive for obstruction.. he has been hospitalized since Sunday on Drip.. he ate yesterday for the first time"science diet" kept it down for 4 hrs.. but then vomited some bile again...What are my options..Invasive surgery is were our vet is suggesting.. HELP..tomorrow will be a week.