Hi Brother!
For a situation of this level, you need to speak to people who have had a similar experience with addicts in the family. Also, even though it is your brother with the poblem, you also need help every now and then. The Icarus Trust is an charity which provides a free Family Friend, who is someone for you to speak to about your situation. And then there is a signposting service to help you find the best help for you and your family. Please get in touch with them on info@icarustrust.org or go to their website http://www.icarustrust.org. It can at least be a step in the right direction to you.
Best of luck!