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If you stopped the lansoprzole and still getting loose stools, then its unlikely to be due to lansoprazole though it can also cause loose stools.
You also have diverticulitis and IBS which causes loose stools
Also bacterial infection of the gut, called helicobacter pylori can present with loose stools.
You need to have stool tests for bacterial infection, as well as faecal calprotectin might show if you have flare-up of diverticulitis or colitis.
If you've not had a recent colonoscopy in the last 3 years, you should consider doing another one
Ok, I've detailed what needs to be done. Is there any specific question you're asking?