The narrator's anxiety is seen when he says, "I felt chilled to the bone despite the fire blazing in the centre of the room." (4)
The narrator was so nervous that he felt "chilled to the bone despite the fire blazing in the centre of the room." (4)
The narrator was so nervous that he felt "chilled to the bone" despite the fact that a fire was "blazing" in the room. (4)
If none of these work, then:
The narrator expresses how his anxiety affected his physical state: "I felt chilled to the bone despite the fire blazing in the centre of the room." (4)