J.D. wrote...
Thread reported. Should be moved shortly.
Anyway, you have a duty (according to law) to get him taken care of as soon as possible. If you don't fulfill this duty by enrolling him in therapy or at least getting him to a hospital, social services may take him away from you. My half-brother had the social services on his ass because his elderly father fell down the front steps when he was away at work for the second time. You have to be careful that this doesn't happen to you, because more than your fear of your brother being a medical test subject, you should worry that he'll be put in the hands of strangers without being able to receive the emotional support of his guardian and brother. I am sure he will fare much better in therapy with you looking after him.
once the state gets involved, nothing good is likely to happen.
i
strongly disagree with any confrontation or deception. he needs to know you are on his side. the last thing you want is for him to not trust you or feel like you are attacking him.
not an expert source, but
this might help you to understand, and what to ask when you do get to the professionals.
copypasted from above link:
Many people who self-harm state that it allows them to "go away" or dissociate, separating the mind from feelings that are causing anguish. This may be achieved by tricking the mind into believing that the present suffering being felt is caused by the self-harm instead of the issues they were facing previously: the physical pain therefore acts as a distraction from the original emotional pain.