Why Do I Get Cold Feet Right After I Decide Something?
The moment a choice becomes real the brain starts pricing everything it just gave up. The doubt shows up because of: 1) post decision regret, since options only become valuable at the exact instant they close 2) loss aversion, because what you surrendered gets weighted heavier than what you gained, automatically and without asking you 3) the Zeigarnik effect shutting off, where deciding ended the thinking and your head goes looking for the loop it was living in. The doubt is not new information. It is the price of having chosen.
What is actually happening
Deciding closes other doors
Closed doors get expensive instantly
The doubt feels like evidence
It is not evidence
How the doubt moves
Ask whether anything changed, or only what you know about it.