An ulcer is not shown by CT or ultrasound
Upper GI endoscopy
is the procedure to diagnose ulcer ad reflux
Your symptoms are typical of ulcer.
Even if an ulcer had been there, 2 courses of H.Pylori treatment might have healed it.
You might be having IBS (Irritable Bowel Syndrome
A Gastro enterologist can do upper and lower GI endoscopy and diagnose. Proton pump
inhibitors, prokinetic or antipasmodic is generally given - Your internist can prescribe after examination