Laika, I second (or third?) the advice to do some volunteering and/or EMT training, and to postpone enrolling in a post-bacc until you're sure it's what you want to do.
My quasi-original two cents to add to this discussion:
1. Is there any way to improve your current situation or recharge your batteries? For instance, a chance to teach a different course and/or an upper-division one? Might you be eligible for a sabbatical, either to pursue some of your own research or [evil chuckle] to begin a postbacc or PA training? I assume changing institutions outright is not an option, given market tightness...
2. You may not be bothered in the least by issues of status, others' perceptions of your aptitude, etc., but you might want to consider possible reactions to your decision from current and future colleagues. If you're leaving anthro with no intent ever to return to the field, you probably won't care if they think less of you. But if/when you become a PA, how will you handle a doc who cops an attitude of superiority because you're "only" an assistant (whether or not s/he knows that you actually have a PhD)? Along similar lines, how do you feel about losing some autonomy/authority? I know PAs actually do quite a bit, and that academic freedom is often not all it's cracked up to be, but the PA does seem to me to be, in the end, a subordinate position.
In conclusion, I hear you loud and clear about the scarcity of academic jobs and the frustration of teaching students who seemingly don't care to learn. I'm on the fence myself about whether or not to leave my humanities field (music history) and move into medicine. For me, it has been (and still is) critical to make sure that, if I make this leap at this point in my life, I do it with my eyes open and for the right reasons--i.e., with full awareness that there will be frustrations in medicine just as in academia, and that I'm switching out of genuine love for one field rather than out of bad feelings about another. Best wishes to you, and feel free to PM me if you'd like.
Best,
NYM 🙂