Hey Jen,
I've never breast fed, so I don't
know the feeling, but I get it too! And I'm not fostering! I get it any time I'm around a crying newborn....even if it's just hearing them on TV!!
I live in fear of actually leaking and having to explain it to people

I just try to avoid the situation, or walk away if I have to.
I chalk it up to hormones. You're not crazy. You're body is saying... hmmmm here's a newborn, I better get ready to care for it.