I can relate to your position, Jeff! I left a job with people I adore but found very boring, as I'd been doing it for too long, for a different role, which made me very unhappy.
Leaving was not an option, so instead I started setting short and long term goals. My goal is to move overseas to work for at least a year, with a view to settle permanently. I've looked at costs, logistics, debt I need to clear before I can do this, and have clear steps as to how I can achieve this, and when.
Having a goal in mind, and knowing my days in a less than ideal job is helping me reach that goal, has been hugely beneficial.
I still have fears - what if I hate it overseas? What if I can't find a job? But it's all about doing research, and preparing yourself!
There's no guarantee that any of this will work out, but it's worth a shot :)