My Husband Had Colonoscopy 3 Weeks Ago, Now Bloated And

my husband had colonoscopy 3 weeks ago, now bloated and stomach tight, had 104 fever yesterday, Took
him to ER they did ct scan and multiple tests - nothing! he had chest pain, pain in right side of stomach, back pain eyes hurt vomiting and chills and trouble urinating. No one in ER even considered colonoscopy just checked for stroke and heart attack. Fever back today 101.5 and shaking - pain not as severe though in chest and back