It's unsustainable, on loan from your future, and soon you'll stop being able to even meet the payments on the interest. Burning out is nothing compared to the sudden stop at the end, and that elusive 'almost there' Is. Not. True.
Whatever consequences you imagine lie before you if you don't stop, simply ponder what a death in your immediate family would do to that prioritisation. It /is/ negotiable, and if it isn't then you're not working for/with the right people anyway. If that's the case you're being treated as a disposable commodity. If you're replaceable, fungible, then you're a cost to be minimised, like a printer cartridge they try squeeze the last out of.
Self isn't something you get back easily (or at all) once traded away. Just don't.