Hi Jay, welcome back.
Let's not underestimate mind control. Many people worry too much and allow topics to simmer underneath as you eluded to. This brooding is not a problem for others. I often hear of comments like "I don't worry about that" or "I'll put that aside for another time"
If we don't have that capability of sufficient mind control then we can learn the theory and train our mind to accept the changes.
So, if you read the basics in the following threads that is the first step.
Beyondblue topic worry worry worry
Beyondblue topic anxiety, how I eliminated it