I've found that when I'm stuck in cyclical thinking, or just feeling stuck changing my body temperature actually makes a difference. A hot bath is one way to go, but lately I've been finding a cool breeze is often what I need most.
Try removing a layer of clothing or opening a window when you're stuck in your thoughts. It’s simple, but it actually helps bring you back into the moment. The goal is getting grounded. Changing your body temperature helps.