Go with your gut instinct. Sounds like they did not work him up properly when he initially went to the hospital. Also, a patient should not need narcan unless they are overdosed with a narcotic. If you have access to the chart I would have medical professionals who you trust review it. Look for doses in the medications. I would a seek a nurse, doctor and a pharmacist. From what you are describing it sounds like multiple problems including human error contributed to his death.