I've Lost my Brother, Can You Help?

Okay, so my brother has had some credit problems in the U.S. He’s moved (presumably) out of the country with no forwarding address or contact info. His communications have been spotty at the best and the last time he made contact was in July. I decided to give him some space, but now I’ve tried to contact him via email. His email is dead. So, I had his Skype info and apparently he has cancelled his account. That’s it, I’m at a dead-end. (I think he is also having some emotional/mental issues [They do run in the family]. I can’t bear to think of the idea that he might need some some of help, but what can I possibly do?) Any idea on how to reach him?