You are like somebody who goes back three times to check he turned off the gas stove. Checking whether that house exists, sounds like compulsion to me. Or like master procrastination.

People's brains are difficult instruments. You must have programmed yourself to be a stickler sometime when you needed that for your work. I am afraid I have no advice for you, other than diagnosing your problem. But realizing the problem could be a start of fixing it.

Ask yourself, what happens if that house doesn't exist? Who will get upset? What is the worst case scenario? There will be somewhere, some other stickler that gets upset, but 99.99% of the readers won't give a shit.