Even if you're taking less than you're supposed to, it's still not a good sign that you were sneaking your mom's medicine. I hate to be blunt, but what happens when your mom needs it and she doesn't have anymore? If your stomach pain is that severe, please go to a doctor and see about getting a prescription or finding the cause of the stomach cramps.

Where I come from, using medicine for reasons other than what is prescribed or taking more than is prescribed is still considered abuse. Please be careful.