Tolerance tests are always oral, simply because skin testing for food allergies is notoriously unreliable.
I'm sorry you had such a difficult time. Here is a site with a listing of lactose-containing food. Plus, you will need to check labels for lactose. One more thing to worry about
- isn't that just peachy?
www.urmc.rochester.edu/childrens-hospital/nutrition/lactose-free.aspx