From last 1 year and so, constantly I have been experiencing a forgetfulness and difficulty in concentration in my day to day life. Additionally a feeling of constant exhaustion had took over, sometimes even during important meetings it starts to feel sleepy and feels like brain is shutting down. And compared to the last year I feel more lethargic and sometimes even I cant even recollect words properly during a conversation. Please can I get what is the actual underlying problem of all these symptoms and how to cure it.