Interesting.....I know more non-musicians with major mental issues than "stable" musicians. I hate to say it but I have two good friends who work in a mental hospital and they pretty much said there is no hope for their patients. They just keep them drugged up to keep them calm.
If you haven't noticed (at least here in the US), there's a CVS/Walgreens on every corner with a 24 hr. prescription clinic. Why are we getting drugged up rather than dealing with our real issues.
In the words of Jello Biafra, "Give me convenience or give me death!". Sad but true.