Breastfeeding Helppp

Okay so my 8 month old son refuse to nurse for the last weeks or so but he’ll take a bottle. Is it because he have teeth coming in? Should I buy nipple shields to trick him into thinking he have the nipple of a bottle n his mouth? I’m having a hard time producing enough for daycare overnight bottles and dinner bottle smh today I’ve pumped 18oz in 5 hours that’s it I need another 19oz to make me feel comfy for the night and to make his bottles for his first feeding at daycare tomorrow please help. How can I produce/pump more