Since how long are your symptoms? Do you have any itching on body? Do you have bloating, nausea, loss of appetite? How severe is you pain on scale of 0-10? Do you take alcohol regularly?
Are you on any medications?
Any past significant medical or surgical illness?
Your conglomerate of clinical manifestations warrant a physical evaluation by a doctor, as soon as possible. Following conditions need to be considered;
1) Peptic ulcer disease
2) Gall bladder disease like stones in gall bladder
An ultrasound is the initial modality which would give some definite clues for the diagnosis and further guidelines for the management.
As you have taken Prilosec, you can take some antacid also like Tums or Maalox. Meanwhile seek an appointment with your physician.
Please feel free for your follow up questions.