Character Profile:

Within the film script that i read there aren't many characters apparent that would indulge a lot of screen time.

The characters that have been made apparent are the:

Main protagonist: of which would be a young female in her mid to late twenties, fair build portraying an emotional character who doesn't deal with grief well, in a sense a fairly vulnerable person, Well dressed, brown hair and a caring person. 

Husband: Not seen much in the film only in a key scene but we see him as also well dressed, a heart felt character who supports the main protagonist well, and again a fair build, darker hair with quite a very well dressed character seen in a suit with a brief case.
Patient: Fairly skinny build, older than the main protagonist between 35-45 years old, dressed well in buttoned shirt, jeans.
Mother: Well dressed, mid 60s, again a vulnerable character only seen briefly

Brother: A little bit younger than the main Protagonist, dressed in youth style, skinny jeans and branded t-shirt, slightly lighter hair than the main protagonist.