While milk and dairy products are most likely to cause you digestion problems, some foods that you wouldn't think would have an effect are: 

• baked goods;
• dressings;
• protein bars; and
• hot dogs. 

There are some ways to include dairy in your diet without suffering the consequences. There are lactose-free products and over-the-counter lactase enzyme tablets that make life a little easier. Calcium supplements can make up for the lack of calcium in your diet. You may even drink smaller portions of milk and consume it during meals when it might be easier to tolerate. 

Even if you find out that you have severe lactose intolerance, it's not the end of the world. There aren't any extreme measures or surgeries needed to correct the condition. Because everybody is different and experiences different levels of discomfort, you'll have to experiment a bit to find the level of dairy your body can handle without having to pay for it. Let's face it, nobody wants to be running for the toilet every time they eat, but with proper management and a careful eye on your diet, this won't be necessary.