Hello,
being a parent I can understand your concern.
The complaints which you have mentioned, points towards infection, and can be bacterial.
Pleaase continue treatment, and let me assure you that, it will take 3-3 days for antibiotics to respond, atleast.
Regarding, Loose stools, its know side effect of antibiotic.
But, make sure your child doesnt go into dehydration. Make sure he pas urine atleast 3-4 times a day.
Health Tips
Hope this helps.