Stomach Cramps

Hello. I'm wondering if anyone else has experienced stomach cramps? I have diarrhea too, which I know is a common symptom. I am on 1.5 mg. Have been on a reta for around 1 month now. In the last week (probably since I went from 1.0 up to 1.5) I have been waking up with stomach cramps, like a really bad stomach ache. I start to eat, and it lasts for a bit, and then midway during eating it goes away until the next time it's time to eat. It's not the typical hunger pangs either. Has anyone else experienced this, and if so, is there anything you did to combat it?