Mommies, I need your help. I have to start treatment with Metronidazo…

Mommies, I need your help. I have to start treatment with Metronidazole, but all sources give different information about it for breastfeeding mothers. I simply need to start taking it in the next few days, but unfortunately, the baby is not taking formula, there's crying and terrible feedings, and we're practically screaming, barely a pause and there could be umbilical hernia. In general, stopping almost impossible. The doctor said it's not possible, but then I find information that children are prescribed it for gastritis. I attach some information, I want to hear your opinion, how would you act? Unfortunately, my illness is advanced, it's turning into chronic, treatment doesn't wait and leads to