SOLVED. SF male protagonist who sticks to routine and doesn't interact with people in an attempt to keep the world from changing around him. [s]

[Kym]

Resonance by Chris Dolley?

[Sarah]

How about The Lathe of Heaven, by Ursula Le Guin? Do you remember anything about aliens, or a psychologist who works on changing reality as well?

[Andy]

This sounds like an interesting story - I've seen this kind of "dimensional drift" in short stories but not in a novel (as I recall).

[Kym]

You’re welcome.

[Andy]

Added Resonance to my list!