Dear User ,
thank you for reaching out for advice , reflux tends to reoccur and the nausea
could be strongly related to your reflux disease which might also cause headache - hard to imagine i know- but yet it does . anyhow if you are still worried regarding your headache you can ask your GP to order an MRI
for you it might assure you that you dont have anything wrong in your brain .
if you find this answer helpful please rate as 5 stars.
Dr . Ahmad