Here's my basic rule:
workers work, managers manage.

If you lied to get the job, then tough. If the job had unique skills required and upgrades after your hiring, then the managers should manage to train you. They are supposed to manage the situation.

Unfortunately, the principle doesn't mean much if the management doesn't buy into it, or there's no Union to force it.

What it does do, hopefully, is stop you from putting yourself down because of job situations that are out of your control.

Back to St. Francis: help me change the things I can, help me accept the things I can't change, help me see the difference.

I've been there. I was unemployed for three years. Since then I've had two jobs, one for 6 years, this one for almost 19.

Practical hint: if the writing is on the wall, look for work now. It's hard to tell, from here, how serious your boss is. I'm from Scotland, all threats are real. It's easier to find work while you're working. For some reason, employers want to "raid" more than help employ people. All sorts of reasons for this but how it affects you is to use the job you've got now to make the move.

All the best.