Male Main Character with a Secret Illness or Disability

completely 100% deaf; can read lips really well; doesn't know sign language b/c his mother is an asshat...

social anxiety; hides himself away rather than face his fear; unintentionally comes off as scary to his subordinates, who are consequently terrified of him...

psychosomatic human allergy; his skin appears to break out into hives and he has trouble breathing whenever he touches another human being; psychosomatic allergy is actually life-threatening...

psychosomatic: (of a physical illness or other condition) caused or aggravated by a mental factor such as internal conflict or stress

panic disorder; occasionally has panic attacks; panic disorder mainly rears its head when in social situations such as public speaking, being alone in a large crowd, etcetera...

antisocial personality disorder (also known as sociopathy); inability to empathize or sympathize; inability to feel guilt; caused by medical malpractice...

SPOILER ALERT:

actually caused by child abuse rather than medical malpractice; a faulty brain scan caused the adoptive father to believe he had medically induced aspd; the result of this was that he raised him believing him to not feel empathy or emotions and telling him things like "you aren't like other people," "you're a monster," "don't have dreams or aspirations...just live quietly," and so on, psychologically damaging an eight (?) year old child...

dissociative identity disorder (split personality); three personalities; does not retain memories from when another personality is in control; personality switch often associated with a rapid pulse and hyperventilation...

dissociative identity disorder (multiple personalities); seven personalities; caused by trauma; implied child abuse...

progressive hearing loss; appears in occasional short bursts of complete and total deafness...

"vampire" virus