Thanks for writing your query.
After reading your post, it seems that you might be correct in considering your symptoms to be due to hiatus hernia
You should continue taking Nexium
. You can add Domperidone
10 mg along with it for better control of your symptoms.
You can have Endoscopy
done to confirm the diagnosis.
Clinical evaluation with a Gastroenterologist will be more helpful in your case.
I hope this is helpful to you.