I can tell I'm getting too stressed out when my eczema flares. Same happens with my mom's lupus.

It for sure is, never mind if someone has cardiovascular issues.

I do as well, and it seriously is. Furthermore, the non-stop self-monitoring for any little thing that could possibly be major illness. Mine is based upon my actual pre-existing/chronic conditions, and it always feels like I'm on alert for something to go wrong.

Probably the worst part of anxiety is that always feeling "on" part of it.