i was at the same crossroads 10 yrs ago. was making good money in it/software, hated my career. nobody thought it was a good idea. to quote my college roommate: "just sounds like you're starting over"
i began selling stuff on ebay, then tried my hand in import/export. a tour of b-school (dropped out), failed dot-com startup, day trading, private research... and finally lifted off with freelance writing.
that same roommate: still at the same job (probably with a raise/promotion or two).
"no guts no glory" --my h.s. calculus teacher