I'm not a doctor, but know enough that all of those things add up to a rather nasty head injury which may be causing other damage.
Instead, they gave stomach medicine, and was told to eat easier food.
Not paying attention until a real check of the head was done almost killed him.
This isn't about the further risks of what is going on, this is just not paying attention to all of the symptoms and/or being smart enough to consider putting them together.
Unless there is a paragraph in the system that suggests that when someone falls and hits their head, gets sick for it, that you should address the symptoms instead of what caused the symptoms, as it's cheaper to wait...