Have you heard of Irish worry stones? Basically, they are made of marble quarried from the Connemara region in Ireland. There's an indentation in the middle of each stone. You rub your thumb against the indentation and viola! your worries magically disappears. Whether it works or not, I have bought quite a few of them as souvenirs for my family and friends over the years.
Imagine my surprise when I'm reading about the healing art of Jin Shin Jyutsu today. Apparently, the thumb "rules" the feeling of worry. According to this healing art, a simple way to manage your worry is by touching, holding, being in contact with your thumb!
Surprise, surprise!