<human>: Can you summarize the given text in a few sentences?

My friend has lung cancer and is becoming insane. It is 2 am at the moment, and he is banging doors in his apartment two floors down, yelling obscenities, and the like. He has always been hyperactive but not in a malicious way. Surely the alcohol does not help, but since he is in so much pain and poor he does not have many options, so he says. His body (and mind?) is in a lot of pain from injuries he sustained throughout the past 10 years. 

I worry for him, though since he is much older than me I can only really think to listen to him sometimes, but it only seems to help minimally. 

He may be hell bent on self destruction! I just don't want to see him get locked up, or worse. 

We are in Mexico by the way, so some options available in the USA are not available.
<bot>: My friend is losing his mind due to dealing with lung cancer, and perhaps other factors unknown to me. What can I do to help him with his internal torment?