sorry to hear this.

can you give up your overnight care and stick to day time only and tell your hubby that, to make it better for you all and give you your family time and he and your daughter, which is important anyway, sounds like you were doing too much to be honest.

A bit of space for you both to clear your heads, think, breathe, may be all it needs too and in the meantime you can change your care to days only, if possible that's what I would do anyway and let him know that, probably better than renting out part of your home, that in itself can bring its own headaches if they complain about noise from children running around above them etc for example and make demands for this or that..