Talking to the Moon

Alano García is an eighteen year old boy living in San Cristobal de las Casas, Mexico. Born on October 13th, 1801, to an indigenous mother and Spanish father, he struggled with hallucinations, seizures and (most notably) a drug addiction.
Growing up in Ciudad de Mexico, he was sent away in order to keep his father's reputation clean.
In his new home he met Sharon Alberty, a woman from England. What the boy didn't know is that Sharon was sent there by his father in order to keep an eye on him.
At the age of 16 his hallucinations are worsened by his mother's death and the passing of his only friend. During this time he became convinced that someone was out to get him.
Flashes of his skinny, pale, lifeless body laying on the floor start to appear in his dreams and Alano has come to the conclusion that this is his end.
The question is, who is the man behind the young boy's suspensions?
Is it really just in his head?