The space is great! I love the hardwood floors and the glimpse of layout and furnishings. Beautiful!

And I love the idea of a sealed room! Does it flank the kitchen? Have they built a wall of cupboards that blocked that room's entry? How odd. Perhaps you are right that they've walled in a spirit--trapped the poltergeist, most likely! ;)

I'm sorry you're feeling low. I do think that sometimes follows finishing a big task like moving. I hope it sorts itself out soon.