URGENT**BREASTFEEDING

Hey ladies! my son is breastfed and I'm on 3 antibiotics as of Saturday night. ive been on metronidizale 500mg two times a day since Wednesday. I began clindamycin and amoxicillin saturday. it was approved for breastfeeding. HOWEVER. My son nursed this morning but ive offered more than 4 times (normally he nurses breakfast, lunch and dinner but sometimes a snack at 3) he has refused every time by BITING my nipple. I dont know what to do. he doesnt. normally take a bottle but its bedtime. hes refused once again. bit hard and through a temper tantrum! I am pumping to see if he WILL take a bottle but... I'm worried he won't. if he doesn't what do i do?? and why is he doing this?! I am on the verge of tears. I dont understand. I am off metronidizale tomorrow evening . I'm taking prenatals + vitamin with biotin as well. please help 😭😰😫

UPDATE:
I did pump a bottle for him and he had 5oz out of the 9 I had expressed. he was full and went to sleep. so..he drank the milk from the bottle...? why is he continually biting my nipple when I offer or fighting me and wanting down? could he be weaning THIS fast?!?