Montresor feels sick at the end due to the guilt and remorse he experiences after he walls up Fortunato in the catacombs to die. This overwhelming guilt weighs heavy on him, causing physical and emotional distress.
Sometimes being tired makes people feel sick. Also some diseases and pregnancy will make you sick at night.
Not if it comes out the other end.
Usually the end of the second month
dilly-dallying makes me sick
It is ironic because Montresor is actually planning to kill Fortunato. By toasting to Fortunato’s long life, Montresor is being hypocritical or insincere since he intends to end Fortunato’s life.
Montresor shows Fortunato a trowel.
Montresor uses the cask, or wine, as bait to lure Forunato into the catacombs. Once they are both in there, Montresor is able to murder Fortunato; in the end, there really was no cask.
Fortunato treats Montresor with arrogance and condescension in the catacombs, showing no remorse for any wrongdoing that may have caused Montresor's wrath. He continues to insult Montresor and boasts about his knowledge of wine, unaware of Montresor's true plan for revenge.
There are only two characters: Montresor and Fortunato the only other people named in the story are Luchresi and Lady Fortunato, who takes no active part in the plot.
Montresor premeditated the murder, which legally is basis for a 1st degree, or "Cold-blooded", homicide, as well as his mocking of Fortunato as he is being walled in. He proudly notes at the end that the site of the murder had been "... undisturbed for 50 years" Montresor could, however, be portrayed as doing this as a crime of passion, as he starts the tale with the fact that he endured "... the thousand injuries of Fortunato", as well as a final insult. He also reports feeling sick after he drops his torch into the niche.
Montresor ends his story with "In pace requiescat" (May he rest in peace) as a way to show his satisfaction and contentment with the revenge he enacted on Fortunato. It signifies his belief that Fortunato deserved the punishment he received and that Montresor has achieved closure over the incident.
In the end of "The Cask of Amontillado," the reader discovers that Montresor has successfully lured Fortunato into his catacombs, where he chains him and walls him up alive behind a brick wall. Montresor then reveals that he committed this act out of revenge for an unspecified insult that Fortunato had given him.