The relief is real, and that is the trouble

When you leave, or check, or ask someone to tell you it is fine, the discomfort genuinely drops. Usually within a few minutes. That part is not imaginary.

That drop is a reward, and it teaches your system two things at the same time. That the danger was real. And that the escape is what saved you.

So the alarm gets more sensitive rather than less, and the list of things that set it off grows. There is nothing weak or faithless in this. It is a learning system doing exactly what learning systems do, pointed at the wrong thing.