I would study my county statistics and opportunities and check government and college job opportunities (would pay better and make going to school less expensive and possible to do both at the same time) and see if I could not get a slightly better paying job and/or find the biggest need (if you live in a town where there are no hospitals, then training to be a nurse is not a good idea?) and work in that direction.

I'd maybe think outside the box; if you are able to sell things and make a bit of money, I'd think about buying other people's things and selling them for more, setting up a weekend flea market table, something to get "extra" money if you are too stressed to consider changing jobs right this minute; if you can shift your energies to doing something you enjoy more part-time, then perhaps the job you are working too hard for (being best employee that gets you a pay cut :-) will not be as stressful and you could just "take the money" and not be so invested in it but rather in something on the side you really liked but could expand slowly.