Hi Kathy,
There is no way to answer your question with out the following additional information:
-a physical examination including a pelvic examination, rectal and stool check for blood
-probably an imaging study such as an ultrasound to look at your gallbladder and pancreas.
-Your doctor may decide based on your examination and history that a trial on antacids is reasonable. Plus avoidance of alcohol, caffeine, and cigarettes.
-other tests that could be considered include a blood test for H Pylori which is the bacteria associated with gastric ulcers and an endoscopy.
If the pelvic exam is abnormal, a pelvic ultrasound is reasonable.
Your symptoms are very common and are usually related to reflux, gastritis, and intestinal ulcers. You are right that women who have ovarian cancer can have months of bloating and intestinal distress prior to their diagnosis. But they are a small percentage of all those with these symptoms. So it is important for your to see your doctor for evaluation.
best wishes