It's causing a lot of stress when I get back home. Wondering if I somehow inhaled it from someone, only feeling relief many days later when no symptoms developed.
To be honest, I could relate to being paranoid somehow.
Don't panic. That's the worst you can do at these times.
First understand that covid-19 is not a fatal disease. The number of people dying from it are due to many other causes like old age and low immunity. Majority of people are recovering from it and defeating the virus. Even in the rare case you get infected with it, all you have to do is maintain your health for the next few days and eat good foods and you will be fine.
But what I do instead, is not to let my worries affect what I can or cannot do under the circumstances, with respect and without prejudice to the concerns of other people as well.
More importantly, as long as I've read and understood what I needed to do in order to prevent myself from getting sick, or be afflicted by COVID-19, this is the barest minimum of protection that anyone can get for themselves and their family.