Hi welcome to HCM.
Your doctor has complete and proper workup and started the correct treatment.
There is grade 2 reflux which need not any surgery and gets relieved automatically after age of 5 , till we have to manage any infection as already started.
Also DMSA scan
is nearly normal.
Even though Grade 5 reflux is also managed conservetively by antibiotics now-a-days.
So dont worry.