Introduction:
The narrator in the story "The Third Level" talks to a psychiatrist friend of his to seek his professional opinion and guidance regarding his fascination with the third level.

Reasons for Talking to the Psychiatrist:
1. Seeking professional advice: The narrator is perplexed and disturbed by his obsession with the third level. He is unsure whether the third level is a figment of his imagination or if it truly exists. To gain clarity and understand his mental state, he consults his psychiatrist friend.

2. Psychological concerns: The narrator is concerned about his mental well-being. He believes that his fascination with the past and the desire to escape reality by visiting the third level might indicate a deeper psychological issue. Therefore, he confides in his psychiatrist friend to analyze his thoughts and emotions.

Discussion with the Psychiatrist:
1. Narrator's experiences and emotions: The narrator shares his experiences of discovering the third level at the Grand Central Station and describes the unique characteristics of that place. He also expresses his fascination with the past and his desire to escape from the present world.

2. Confusion and doubts: The narrator admits his confusion about the reality of the third level and questions whether he is living in a fantasy world. He discusses his uncertainty about whether the third level is a physical place or a mental construct.

3. Fear of losing touch with reality: The narrator expresses concern that his obsession with the third level might lead to detachment from the real world. He worries about losing the ability to differentiate between the present and the past.

4. Psychological evaluation: The psychiatrist listens attentively and analyzes the narrator's thoughts and emotions. He explores the possibility of the third level being a coping mechanism for the narrator's dissatisfaction with his present life. He may also delve into the narrator's past experiences and traumas to gain a deeper understanding of his obsession.

5. Guidance and counseling: The psychiatrist offers guidance to the narrator, helping him to differentiate between imagination and reality. He may suggest therapy or techniques to help the narrator ground himself in the present and cope with his desires to escape.

Conclusion:
The narrator's discussion with the psychiatrist serves as a means of self-reflection and seeking professional guidance. Through this conversation, the narrator hopes to gain clarity about his fascination with the third level and address any underlying psychological concerns. The psychiatrist's evaluation and counseling can potentially help the narrator find a balance between his desire for the past and his ability to live in the present.