@Lane I've been noticing it, purposely.
For me, fear or anxiety opens the door to the disfunctional loops. It's remarkable, though not in a good way, how a small thought turns to thousands. Metaphorically it's like adding sugar to warm water and yeast.
I'm sorry you know about it, what I'm reffering to Lane; and I send support in the hopes you remain free of the fear and depression.