I contacted my doc today about asking for o2 (she has been my doctor since before I had my CH) anyway, some returned my phone call and said "what is o2 gonna help with?" I nicely asked her if she had any idea what cluster headaches was and she didn't answer, she then told me that she couldn't get me an apt for another month and "if it gets to bad go to the ER" with anger I told her I would find another doctor and hung up. How can you be a nurse and not know these things? I'm so upset. I will spend tomorrow looking for a new doctor.