Can I add one more thing? Try to find something for your mouth and your hands to do. You could chew gum, and maybe take up a craft like knitting, or just carry around a worry stone that you can play with, or develop some finger exercises. When I was in about second grade I was taught some finger exercises to improve coordination (basically just touching each finger to the thumb, going back and forth) - you could try that. Originally I was supposed to do that because my handwriting was so bad - it was later discovered that my family has a minor form of muscular dystrophy. The finger exercises became a habit for me, and later when I learned sign language I started practicing finger spelling like all the time. I digress, but you get the idea - some people need something to do with their hands, and I think there may be a connection between that and a tendency to be more susceptible to addictions.
<font color=orange>There is an easy answer to your problem that is neat, plausible, and wrong.
</font color=orange>