NervUS wrote some words above that are so valuable....

Accept that risk is never zero, and all people live with that circumstance every single day.

Getting to a place of acceptance is what gets me through HA. And, I do get what you're going through. I have a bat story that would probably make your hair stand on end and I had to put acceptance into action, and it did release me from the fear state I was like paralyzed in after the exposure I and my family had. We have no choice but to accept that we are part of nature, we interface with it, and sometimes it takes us out, and that is just the way it is.
I want to repeat them because it is something that has liberated this poster from extreme anxiety about a lack of control over perceived risk. Living is a risky business, to each and every one of us, just as it is to the butterflies, birds, dolphins, fish and possums - its part of being alive. The possums don't sit there stressing about 'what ifs' they get on with being alive