I am desperate can someone help me?

Do you not know where it is that he works? Im sure this is obviously one of the first options you would try, but if you can somehow contact his work, you can find out if he has been attending or not. Also, you could type his full name into a search engine on the internet, and if anything has happened to him it is public information and you should be able to find it. This is a difficult situation and I am trying to rack my brain to think of things to help you, but i am sure you have tried everything I have said. Good luck and I hope you find your brother soon.