To write a hospital scene well, you need to pay attention to details. Observe how the staff behaves, the equipment present, and the expressions of patients. Also, think about how the hospital environment affects the characters' mental states.
One scary story could be about a patient who always saw a shadowy figure at the end of their hospital bed in Chuck hospital. Every night, as the nurses left, this figure would slowly emerge. The patient was so terrified that they couldn't sleep. They tried to call for help but no one seemed to hear. Eventually, the figure just disappeared one day as mysteriously as it had come.
The unknown factor makes it scary. We don't really know what's lurking in the hospital corridors or rooms. Just like in any horror story, not seeing the full picture is terrifying.
In general, the Evangelion mangas are considered good. They expand on the anime's universe, providing more depth and character development. However, it depends on personal preferences as some might find the style or pacing not to their liking.