What do you do when you're down to nursing only once a day and your child refuses to nurse?

Xander's had a stomach bug and hasn't been eating or drinking as much as usual, but had been nursing just fine. But yesterday, he pretty much refused milk all day and this morning he wouldn't nurse at all. Every time I tried to nurse him, he would just start crying and fighting me.

I ended up having to send him to daycare without feeding him so I pumped instead, but I only got maybe half an ounce out. Is this signalling the end of our breastfeeding journey? What do you do if you're down to nursing once a day and your child refuses?