How can I talk to my psychologist about upping my dose of Xanax?

I've been on 0.5 mg of Xanax twice a day for the past month. It hasn't been helping me at all, but when I take 1 mg during a big anxiety attack, it calms me down. I was wondering how I can ask my psychologist to up the dose to 1 mg twice a day without her thinking I'm abusing them. I just have very big anxiety attacks. Should I stay on the 0.5mg and deal with the attacks or should I ask to up the dose? I'm afraid she will take me off them and put me on something else.