What can I do to get my spouse to appreciate me as a stay-at-home mum?

I think, first of all, you should be asking: "How do you feel about being a stay-at-home mum?" You should feel fulfilled with your status, and hubby should be supportive of it. He better appreciate you for being a SAHM since you're making sure you personally take care of your home and the family! That takes a lot of focus and love - and you deserve love and focus from hubby in return.