From what I understand about visual imagery. Is imagining yourself some place you would enjoy and all that would go with it. For me I imagine myself on an island with my bf and his daughters. Anything that helps me distract from what is on my mind. Someone else may be able to give a better description of visual imagery. That is my understanding of it.

And your not alone. I struggle with brooding, worrying a lot. I try to distract myself as much as possible. That way I can't think about what is bothering/upseting me.