These are just thoughts based on things that have happened to me in the past-
Often when we find ourselves with an increase in responsibility, it will create added stress which will cause our anxieties to be affected. Stress of course can already be there in our lifestyle at home or at work.
Often though an increase in responsibility such as a promotion at work and extra workload or moving into a new home, getting married, having a baby to protect etc will trigger "worry" creating irrational fears which will feel real.
When we feel under stress due to extra responsibility, our minds will often look for dangers in "ordinary things" which otherwise we'd not think about. This could been that when we see a knife, we'll worry about harming ourselves or others because of the fear produced by the extra pressure we feel to protect what's important to us.
If we dwell on the thoughts, the thoughts could change from "what ifs" to imagining "doing". We picture images of what "could" happen which in reality wouldn't because it's something deep down we wouldn't do but our extra responsibility will create stress which amplifies our fear into making us picture the "what ifs" as "doing".
Extra stress can also make us focus on health issues for the same reasons. A fear of "losing" something that we feel is very important to us such as our own lives or others, or possessions.
The way I've found to deal with these thoughts is to not dwell on them by saying to myself they are just being created by "worry" and fear of losing something important to me. To know that they Are just "worries" playing tricks.
Sometimes we are bored which I call "boredom stress" because when we feel under stress but are bored, we'll start looking for something to worry about such as the above.
This means that we not only need to remind ourselves they're just "worries" but also look for something to occupy our minds to help us not dwell on the irrational fears before they "get to us".
We get lots of weird thoughts but fearful ones will stick because they scare us and make us worry, and then we start "playing" these worries in our minds but they Are just thoughts that we wouldn't act on.
Often we just love to find something to worry about because of our negative thinking but we mustn't be afraid or dwell on them and instead treat them as all the other ordinary thoughts we have.