Does Stomach Ache Trigger Absence Seizure?

My daughter was diagnose for abscence sezure when she was three years, and she is now 11years. we have done series of medical test ranging fron EEG, CT SCAN, and many others which make the doctor place her on combination of tegritol and lamotrigine. Since then her case did not improve. she had attack almost 7 to 10 times a day mostly at night. The common symptom observed now was stomach ache which triggered the attack at night. I will be glad to tap from your experience.