How can a Dr. do this?

May be your doctor felt that she was over prescribing you and decided to cut on your medicine is what I am seeing in your statement . I am positive you will be able to live with less medication as they become ineffective over the long term usage . In other words your body does built an immune to the drugs . As well she may have detected either a smell or found marijuana in your blood is what I am uming . She may well doesn't want to be your enabler and she is doing this for your protection as you become addicted to the drugs . Over the long term usage of any narcotics you become dependant on them and feel that you can't live without them . No offence to you but I feel she may be doing this in your best interest . Good luck