Everyone is different as to how the meds will help....most of
us need to modify diet and lifestyle... AND when on a med like
Nexium....which is a PPI (proton pump inhibitor) you need to step off the meds slowly to help prevent rebound effect which can cause your symptoms to increase.
Talk with your Dr again, let him/her know you felt better on the med and now have symptoms returning....the Dr may offer to change the dosage and suggest you modify your diet....