You should ask for a hydrogen breath test. Eliminating all
milk products is not that hard. I have had zero
milk products for 2 years now. I have also been strict vegetarian for 11 years. Also, I had zero milk products, strict vegetarian, and zero gluten for 2 months. If yoru problems are not severe enough that you don't want to try a lactose free diet, then that is your choice. All you need to do is eliminate all milk, cheese, ice cream, yogurt, etc.