Case tell us more about what's going on? A pain Dr usually will not take you off of your meds for no reason. Did you have a urine test that showed no meds in your system? Why are you running out of your meds? I take it this is happening before your visits?
If you're taking your meds as prescribed you should not be running out before your visits. If you're taking them as prescribed and your Dr just cut you off for no reason then it's time to find a new pain Dr.
Please give us more information so we can better help you.