Worry beads (aka komboloi) are a string of beads that can be manipulated with your hands and can help relieve stress and tension. I was looking for ways to help with emotional eating and anxiety and I came across the beads in my research. There is nothing magical about them; the action of moving them around in you hands and the rhythmic clicking of the beads make can be soothing. I have found them especially helpful at night (my anxiety tends to be higher at that time) and I like to use them when I am on walks.
I made a sting of them with a some craft materials I had a around. I just used some beads and soft yarn. Here's a website that has a tutorial on how to make them: