which two sentences contribute to the overall eerie mood of the adapted expect her from the fall of the House of Usher by Edgar Allan Poe

In this mansion of gloom I now proposed to myself a stay of some weeks.

The writer spoke of a kind of illness--of a disorder which oppressed him--and of an earnest desire to see me.

Explanation:

These two sentences contribute to the overall eerie mood that we find in this text of "The Fall of the House of Usher." In the first sentence, the author talks about a "mansion of gloom." This conveys the idea of a house that is old, abandoned, or that promises something terrible. The second sentence tells us that the author of the letter is "oppressed" by a disorder and desperate to see the speaker. This also appears to be a premonition of something terrible to come. Both of these give an eerie mood to the text.