@edijoke - In your posting you mentioned the doctor saying it could be abdominal migraine or an abdominal vascular problem. To look for vascular abnormalities an abdominal Doppler ultrasound is done to detect blockages etc. if the test shows something abnormal a CT angiogram with contrast is done. The tests you already had would not necessarily show this.
This happened to me- a celiac artery blockage from pressure by a ligament - the median arcuate ligament. The Median Arcuate Ligament Syndrome, abbreviated MALS, is rare. However, I found many with this syndrome here on Connect.
It can’t hurt to ask for the abdominal Doppler ultrasound.