Metronidazole & breastfeeding

Hello mummies

I'm prescribed antibiotics for an infection with my stitches & I've noticed some change in my baby boy.

My lovely placid boy has gone from peaceful and lovely to constantly screaming and in pain.

Changes in his poos & feeding habits made me think it might have something to do with my antibiotics and I'm worried about him. I don't want him in pain like this, nothing soothes him - he just cries until he falls asleep.

Advice? What should I do? I cant get an appointment with my doctors surgery for the life of me and I've tried everything to help him, I'd just like some advice :(