The counsellor may still be your best route of action. Just because the counsellor can't reply to you, doesn't mean you can't speak to her. Write her a letter, outlining all of this stuff. Your brother may see that as a invasion of his privacy, though, as you are also a confident. Only you can understand precisely where the boundaries are.....but you may be able to say the right thing to the right person without breaching confidence. I'm sure your brother is aware of the extent of your concern.

The rest of my advice is to break away from this situation. You are way too involved in something that really is your brother's business. He can't suppress himself forever. You could benefit from counselling, yourself. Learning how to separate your crap from your brother's crap is a valuable skill.

Lar