My Father is suffering from confusion after hospital stay, what should I do?

My father has gone to hospital emergency last Friday afternoon due to pain and diagnosed with Abdominal Aortic Aneurysm with 4.3 cm. He was not being released due to uncontrolled BP at 200+/110+. During the hospital stay, the hospital given him many BP meds to bring it down. After released from hospital, he became very confused, such as drinking pot cover wondering why there is no water. He also added chicken powder in his coffee. Last night, he sing songs loudly during the med night, laughing by himself, talking. Do it looks like medical induced, temporary confusion, or vascular dementia? He was cognitively smart before but all the sudden, he became confused. What should I do? Should I observe some more days or should I contact his family doctor immediately? Should I contact her, what should I say?