Hello,
Welcome to ehealthforum
The symptoms explained by you as abdominal pain,nausea,fatigue and dizziness can be due to:
GERD or Reflux Oesophagitis -- It should be relieved by intake of antacids. Continue with the medicines as prescribed by your doctor for at least for 10 days and then observe for changes.Endoscopy would help in ruling out this.
The symptoms you are complaining can be due to Gall bladder Stones or even inflammation.They are commonly associated with belching, indigestion.USG scan would help in ruling out this.
Enlarged liver - It can be ruled out with Ultrasound of abdomen.
I would advise you to visit a Physician as clinical examination and investigations as USG scan would help in ruling out the cause and then treatment can be started.
Take care!