Hi, Welcome to icliniq.com. To answer your first question regarding lactose intolerance, lactose intolerance will cause predominantly bloating and loose stools. Both Ranitidine and Lansoprazole have a different mechanism of action, taking one class of drugs for reducing your dyspeptic symptoms are recommended. Any history of fingers turning white on cold, joint pain, or fever? I would suggest you undergo rapid urease breath test for Helicobacter Pylori, motility studies. If you think protein shake is the culprit for your dyspeptic symptoms, stop for a while.
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