Teething!

My little one is 5 months old with 5 teeth. Two on top and 3 on the bottom a few weeks ago he started biting so we started weaning him until he bit so hard he made me bleed which is when I started exclusively pumping. The problem is I can’t keep up with him! He eats 3-4 oz every 3 hours during the day every 5 hours at night. I pump every time he eats and power pump once a day. I’m hoping someone has some advice either about how to get more milk pumping or how to breastfeed him without losing a nipple 🤣