Wow - they weren't kidding

So today I brought a frozen entree that stated "no gluten ingredients", cooked it in the microwave and then read the back of the box.  It stated something like, "Produced using machines that also process nuts, milk and wheat".  I KNEW the dietician said this was an no-no.  But I ate it anyway.  And was I ever sorry!!  I've had stomach cramps and other pain all afternoon.  Could it have been something else in the ingredients?  Maybe. Probably. But I'm not doing that again.