Can citrobacter werkmanii /youngae in stool go away without antibiotics?

[Uptoyou1]

My 20-year-old son has had Gerd his whole life.  He stopped his Nexium at 18 years old and has been OK. About four months ago he began having daily nausea.  He has lost 10 to 15 pounds and has stabbing  pain in his stomach. Vomits pretty much daily. Throughout the day it gets somewhat better. But chronic pain in his abdomen and extreme intermittent nausea. Have had several tests. Positive h pylori in blood. Treated one week quadruple therapy. Only to find stool test negative. NP stopped antibiotics. Gastric emptying study negative. Blood work and urine negative. CT of abdomen in ER negative, except some fat on liver. Stool positive for citrobacter wekmanii/younga. NP wants to put him on 1 week of cipro antibiotics. But the last antibiotics made him much sicker and he's afraid to take them. Absolutely NO appetite.  NP won't escalate upper endoscopy. Scope not scheduled until 8/29. He's so sick.  Zofran helps somewhat. Taking nexium daily.  Do you think it's important he take antibiotics for the citrobacter? Or can it resolve on its own? More antibiotics will rip his stomach apart. I can't get him to anything eat toast, yogurt, saltines. The thought of food makes him wretch. (And being 20 makes him stubborn and not completely compliant). I'm afraid we are missing something in his testing. Feel like something is seriously wrong. Should he take the cipro? We r told he can't take zofran with it and I don't know how he will function without that. Please help.