I would suggesting seeing your personal physician.
In general, chronic nausea can be indicative of an upper GI condition. An upper GI series can be considered if your doctor suspects this.
Liver and gallbladder disease can also be considered, and evaluated with abdominal imaging like an ultrasound or CT scan.
I would also consider blood tests which may suggest a possible infection.
These options can be discussed with your personal physician.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
KevinMD.com
Twitter.com/kevinmd