Medicines Intake. Take and for how long?

Hello, I have been on Trazalon 20mg for around 4-5 months now for my anxiety issues, and have been visiting my doctor, every two months, so that he can prescribe the doses again, once I run out of them. During our last meet, he asked me to continue the same dose, for two more months. And now that I am done with it, I had another appointment due this week, but due to academic reasons, I have shifted to another city. Now, I don't know for how long should I take this dose. Each time, I met him, I said that I was feeling completely fine, but he urged me to continue the same dose and said that he would decrease the dose gradually. I have been on Trazalon 20mg for 5 months now, can I reduce the dose now? How much should I take and for how long? Could you please help me reduce the dosage, and give me a proper schedule as to how much should I take and for how long? Please help.