What should I do if my child has diarrhea and vomiting after taking medicine?

Patient's question:

The child only has a high fever without other symptoms. The complete blood count report shows C-reactive protein at 17, and the doctor said it's a common respiratory virus infection. The doctor prescribed azithromycin tablets. After taking it, the child started vomiting and having diarrhea. The child hasn't shown signs of high fever since midnight yesterday until now.
Previous treatment and effectiveness: Azithromycin tablets, Xiao Er Shu Qing (Children's Fast-Clear)
What help has Xiao Er Shu Qing provided: We've only taken azithromycin tablets twice, and the medicine is indeed effective, but the side effects are too severe.
How can we stop giving the medicine to the child? If we can't stop, can we switch to azithromycin?
Hello, is it effective to take azithromycin in this situation?

Doctor's answer:

The baby is showing symptoms of vomiting and diarrhea again, which should be side effects caused by erythromycin. If the symptoms are severe, other medications can be used for treatment.
The elevated C-reactive protein indicates a bacterial infection, so antibiotics are needed for treatment. Therefore, the medication cannot be stopped for now. Azithromycin, penicillin-class, or cephalosporin-class antibiotics can be used for treatment.

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