OMG I could have written your exact thread Astrid. We are currently going through the exact same thing with our eldest DD (7.5) and in fact it got so bad today that I have made another appt tomorrow with our GP. She was lying on the couch in tears for around 3 hours, didn't eat her fave lunch (which is so unlike her) all because of the pain.

DD's pain has been going on for approx 2-3 months, initially at bedtime so we cut out the milk before bed routine and that seemed to help somewhat. But lately it has now been occurring at different times of the day and she doesnt eat alot of dairy so I don't think that is it. Approx 3 weeks ago we had to provide urine and stool samples for her but they came back all clear and the GP said that it is therefore more then likely related to stress/anxiety as well. Interestingly he did ask about migraines in the family and I have suffered from those.

I really hope you get some answers as we are heading down the same track as you and it is so so frustrating.