Is there a phrase called "flip the switch" or "flip one's switch"?
Solution 1:
“Flipping a switch” is a literal phrase describing turning an electric circuit on and off with a wall switch or a similar device.
Metaphorical uses are easy to imagine—a sudden realization or insight, for example. This is the use made in the sentence you quote.
The use “flip my switch,” as though there’s an internal switch, is not one I’ve heard.