how about sending him a letter or email about suggestions for him getting help? you could even refer him to someone you know or see. i'd also tell him how much you love him and that you want mmore for him in his life.
hopefully he'll read the letter and think about it. this way you aren't caught in the crossfire when you're trying to chat with him. i'm sorry for you and your brother. i hope he gets professional help. it sounds like he really needs it. hugs to you. 
oh and yes there's a condtion called light deprivation that can cause severe depression. i know because i have it. there are solutions for this too.
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Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all. Do not let the hero in your soul perish, in lonely frustration for the life you deserved, but have never been able to reach. Check your road and the nature of your battle.
The world you desired can be won. It exists, it is real, it is possible, it is yours..~Ayn Rand
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