My friend has a roommate who is CONSTANTLY throwing up, but not in a trash can or toilet, in plastic grocery sacks. Her room is right next to the bathroom, but instead of trying to get to a bathroom, she uses these bags and either throws the bags full of vomit in the kitchen trash can, or leaves the bags full of vomit in her room. Tonight she left a full bag hanging on the bathroom doorknob. She says she has a medical reason for her constant vomiting but I can't remember what she said besides that there was something wrong with her stomach. We can't figure out what would make her only use plastic bags and why she would just put them in the kitchen sink, her bedroom floor, or the bathroom doorknob of all places! Is there some mental illness we don't know about that would cause this behavior??