I am a 49 year old man with a history of anxiety problems. I also have IBS with alternating constipation and diarrhea. Lately I have noticed that my stool floats. It does not appear greasy. For about the last month this has been happening with regularity. It is not uncommon as it has happened off and on before but now my anxiety has latched onto it and I am greatly worried about pancreatic cancer. I am 6' 1" and weigh 265lbs and have never smoked.
Is it possible to develop a lactose intolerance later in life? Just wondering. Thanks.