I hope you're not joking. If not: please seek help. If you feel like it is an actual, physical metal cage in your head, well, it does sound a bit like a psychotic episode and chances are that you are probably not up to dealing with it yourself.
Quote:
It was a literal, not figurative, cage, that I got into by not being prepared
Can you perhaps explain why you feel that you weren't "prepared"? For what? Since when have you felt this way? What happened?