Stress, anxiety , with Lip and cheek biting.

I am under the care of a Psychiatrist for anxiety & stress. Altho I had times in my life when I did the lip and cheek biting thing I always managed to over come it. In Feb. of 2009 when I found out I needed a hip replacement, it seemed the lip biting thing came on with a vengeance. I am so tired of chewing gum. It gives me jaw pain and headaches. I had the hip replacement with a remarkeable recovery. Having no problems and walking like a champ. I am going to be 79 years old 10/19/10. The only other set back I have is my 42 year old daughter has mental problems caused by years of drug taking. She had been married and has two children.
For the most part she is a good Mom. As soon as I get around her the ole lip biting starts.
she keeps telling me I have stress and anxiety. Which I am aware of. How do I convince my Dr. to help me with medication to get this thing under control. If I was a youg woman I could understand not wanting to give me a lot of drugs. But I am not I would like to live the rest of my life not eating the inside of my face. I do not enjoy it and it makes me nuts. Plus try shopping and not realize what you are doing . It is embarrasing. HELPHELPHELP Virginia