Motions and fever to my 2 years old Son.

My son is suffering with loose motions (4-5 times) since Thursday morning to till evening. We went to Doctor in the evening and explained about the problem she told us that its a tummy infection(viral) we have to give him more fluids and light food with prescribed medicines like good bacteria capsules and Z&D medicine. She told us that motions will not stop immediately it will take 2-3 days to cure and she told us that in between if boy is getting fever more than 99.8 degrees asked us to give paracetamol drops. After coming home there is no temperature, we have given medicines and baby slept with in a hour baby got the fever of 100.5 degrees. We have given Meftal P of 3 ML and waited for 3 hours but still fever is not reduced. Can we give paracetamol drops now. Please suggest.