Nichole: step back and take some deep breaths. You've been a member since oct 2008, so you have some education under your belt.
It's not part of God's plan for your brother that you would be a nervous wreck over his recovery.
Perhaps when he calls and vents to you, you could gently but strongly rebuff that by telling him he knows by now, after 7 months in rehab, where he needs to be right now - not on the phone with his sister but planting himself at meetings - it sounds like he lives in a populated enough area to be going to 6 meetings a day. And there is probably a "club" (here it's called "Alano Club") that is a hangout place for recovering addicts to play pool, socialize, etc., but also has umpteen AA meetings every day from morning to night.
At any rate, he KNOWS he is not to look for his recovery in his sister. Yes, you are enabling him by allowing him to do that instead of gently insisting that he take his recovery issues to others in AA.
Keep coming here, go to meetings yourself, and pray...