Ohhh! I love interesting energetic stories such as this. Fascinating. We'll just say I've had some experiences that have left the door open for those "unseen possibilities."
First and foremost this is our realm, the physical world, and even if there are "energies" leftover from long ago their job is to find their way to the light. I've found that even stating that is helpful if you have encountered a space with a lot of old emotional, mental or etheric energies. Marie works with space clearing on many levels, the physical being just the beginning.
When you're space clearing be sure to be in a grounded state, the more grounded you are the less you may feel affected. The Tubes of Light Meditation is a useful one for claiming your space and protecting it.
Just like when you detox or really start cleaning a room, things can seem messier before they get better. Sometimes that can happen energetically as well. You've begun transforming your home, yourself and the world around you responds.
All the best!
Kat