5 year old still has very acute pain!

Hello, my 5 year old boy had an appendectomy 6 days ago and still has very acute pain since the surgery, always around the bellybutton, every 7 hours after intake of medication (antibiotics, painmed) he starts crying so bad that he fallls asleep due his superficial breathing caused by the pain. He can\'t sit down nor walk without crying due to the acute pain. Eats well, has no fever anymore, but urinates almost every 30 minutes and is then in pain too. Still has a lot of gas and problems to evacuate. Is it the normal appendicitis-surgery recovery process? Or might there be something additional. My mother-instinct tells me he is not ok, despite the surgeon says it\'s normal. Please help! Thanks!