Yes, I'm PO'd

I'm pissed. Sorry to start things off like this, but I'm pissed. ...
About every two weeks since January I've placed a call to my oncologist to have a prescription called in to my pharmacist for cough medicine. It is a controlled substance, so they'll only give me a 12-day supply. Today, I was told by a nurse that I could no longer get the medicine, that I would have to visit my lung specialist before getting a new prescription. The implication was clear. I'm abusing the medicine. Never mind my 12-day prescription usually lasts for 14 days. Never mind I have lung cancer. Hello! Is it really unusual for someone with lung cancer to have a mild cough? I still have a mass in my lung! Several times I've mentioned the cough to my doctor. Her response is usually the same: Do you have enough cough medicine? So, I'll go to my lung specialist tomorrow. I hate to say this, but I've lost confidence in my oncologist's office. To hit me out of the blue with this is unforgivable. ...
There. I've had my say. And I'm still pissed.