Adult-Onset Digestive Disorders

I’m 48 years old and have suddenly started suffering from lactose intolerance. I am avoiding all kinds of dairy to prevent the bloating and pain. I thought that was the end of it, but other foods are bothering me now, like peanuts and meats. The list of foods I can eat is shrinking by the day. Do you think I might have a serious problem in my digestive system? Should I go for intensive testing?