Something similar happened to my father-in-law after he came out of surgery. He kept thinking my husband was one of his brothers and insisted they were in Spain and everyone was speaking Spanish. They weren't. They were speaking English. All the nurses were speaking English. They were in a fine US hospital. But my FIL insisted, strongly, that they were in Spain, Look Out the Window! It's obviously Spain. Then he demanded a beer because his head hurt. This kept up for a couple hours. My FIL remembers nothing about it now.