Talk to Neuro Physician on Memory Loss

I have memory and focus problems since 3-4 years and it's getting worse day by day. when speaking with people I suddenly forget what I wanted to speak about in the middle of conversation. Now I am facing another problem: I can't understand what others are saying. I am like only listening to the sounds of other people not their words. I forget what I thought and plan a task a minute ago. Which doctor should I choose for this issue?