Thanks for this! I've been suspecting as much. I've changed jobs usually after a maximum of three years before, and haven't felt a fatigue like this earlier, as starting a new job has pretty much always worked out quite well.
I think it's a mix of a few things for me. I should probably just find a new job ASAP (but need to finish the education), get back into therapy, and somehow, not sure how, try to get back a solid sleeping pattern (very hard with a kid that wakes up several times over the night). I need at least 6 hours of good sleep myself, but I can't remember the last time I got that. Definitely plays into the whole situation, I reckon.