I'm not sure I'll be able to communicate what my fear is but I'll give it a shot.
I keep imagining that the whole house goes bang like something explodes or the house falls off the foundation.
It's weird and I know there's next to no chance this will ever happen but I can't shake the notion.
Also, I have to say that home ownership - not as cracked up as seems. You worry about stuff; what to do with your garbage, plowing/shoveling, oil, repairs and maintenance, yard care...When I was renting, we had people do that stuff for you. Now it's all up to us.
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That is my spot, in an ever changing world, it is a single point of consistency. If my life were expressed as a function on a four dimensional Cartesian coordinate system, that spot, from the moment I first sat on it, would be 0-0-0-0.