Have irritating habit of constantly "moving" my lips/mouth. guess it's psychological but seems like a small thing to see a psychologist about.

Mouth movements: Have you been on psychiatric medications previously -- before the mouth movements began? Or have these appeared without this? Antipsychotic medications can cause movement disorders, which can show up in repetitively moving mouth and tongue. I suggest you see a neurologist first, before the psychologist, as it may not be psychological. Anxiety can worsen drug-induced movements too, though.

Moving lips: If it is important to you, it is important. Please start w/a visit to your doctor. Some medications can cause lip and jaw moving as a side-effect. Then you can see a clinical psychologist to work on stress management. Peace and good health.