You said it with your first sentence. Your father got sick. People have been getting sick from the dawn of time. People absolutely can be disoriented and hallucinate from high fevers. This also has been happening from the beginning of life itself. There is nothing unusual or special going on. Your father has caught what forever has been labeled the flu, or has a infection. That said , hope he feels better and wish a quick recovery. P.S. turn off your TV