Never been to the Lemp Mansion myself (I'm over in Japan so it's a bit of a trek) but I find these physical reactions to locations really fascinating from a research standpoint. Like is it psychosomatic because you already know the history going in, or is something genuinely affecting your body?
I've read a few accounts of people feeling nauseous or getting sudden headaches in specific rooms there. The old brewery tunnels especially seem to come up a lot. Some researchers think its related to infrasound from certain building structures which can cause that kind of feeling without any "paranormal" explanation needed.
But then again that doesn't fully account for it either does it. What room were you in when it hit you? And did it pass once you left the building or did it linger? Really curious whether other people in your group felt it too or just you.
