Well, music is indeed a super-risky career since the bimodal distribution skews towards Poverty....Megabux, although as someone who makes electronic music I am only familiar with the left end of that graph ':->

But it would give you something nice to do outside of work, and you can leverage technology as much or as little as you prefer. This would at least 'stop the rot' by compensating yourself for The Job You Hate in the short term, and might help you open up mentally to other possibilities int he longer term. If you're naturally talented you certainly have an edge over me.

I wouldn't discard your IT career just now. You're likely to be hating some particular aspects of your current job (long hours/little vacation? monotonny? stupid management? dull coworkers? feeling of isolation?). If I were you, I'd try to pinpoint them and try to work myself into a position (most likely by changing jobs, maybe going into a different specialisation) where they aren't such an issue. Even if that transition isn't easy to accomplish, it'll give you some goal to strive for, which in itself works wonders for mental well-being.

Please, don't make any long range decisions like school right now. Try a week of walking out in the sunshine and fresh air whenever you have time, instead of just wasting the spare time. This will help you sleep, and sleep will help everything.