My father is a 67 year old man. He went for a meeting. He felt weak. However, he gave his speech and after the speech when his friends asked him why he did not mention certain points? He looked blank at them. He said "what did I say? Why am i here? Which place is this?" His friend explained to him why he was there and what he spoke etc. It took him almost 45 mins to normal. So we are very concerned as to why it happened? Which doctor should we consult?