Are you sure it is reflux and not just normal spitting up? Some spitting up is normal. As long as bub is gaining weight overall, spitting up doesn't hurt them. They will outgrow it over time.
Also are you taking any other forms of diary or topping up with FM? if so, do stop all forms of dairy except BM. PS - Dairy is not just in fresh milk but also in milo, cakes, some breads.
When my bub had reflux, my p asked me to prop baby up most of the time. Was gone by 2 weeks.