Talk to Pediatrician on Feeing Extremely Nauseous

This is the second episode of my daughter have the nausea round. She feels extremely nauseous. In the morning and vomits plain water without even drinking, through out the day she is fine alhamdullilah, but she is very sensitive to smell during this phase, it last for sometime where I give her reflux medication/ dompy when its extreme . And then she is fine for some time . Before this when this happened we had her checked for uti/ kidney/ xray before it was diagnosed that it could be reflux or stress ( she had just joined school) but now she doesn’t have school also. So its reflux. Will taking reflux medication have a long term effect on her ? How long can I continue this? .anything else I can do to help her? Recently she also had a round of antibiotics. But we had this vomiting episode for almost 4-5 months before it subsided and started again after the round of antibiotics