I don't think you blew it at all. It takes so long to learn a job, and most jobs expect SO much more than they used to, that changing jobs really IS stressful.

I think about changing my job every time they tell me I'm inadequate (I'm not, but they don't want to give out raises), but realistically speaking, there isn't much around here that's any better but there are jobs that are, unbelievably, even worse.

I agree with all the posters here who said lots of people are where you are right now. I totally get where you were coming from and have done exactly the same thing. Don't want to be unemployed, don't like my job, scared to change for fear I'll be in an even worse job.

That's it in a nutshell.