Here's a nicely done long research piece on White from Grantland. A lot of good info about his past and issues. Apparently the fear of flying thing is pretty overstated, although reading it it's clear that this guy is a all over the place mentally. He's certainly not stupid. Probably has some Adult ADHD in him if I had to guess.
Still a really intrigueing player as the draft wears on because there's a definite risk vs. reward thing with him. His playmaking skills at his size are without question unique. He's not like a lot of the perimeter bigs because he's not a jump shot first guy like Antoine Walker was, but the Anthony Mason comps make a lot of sense.