I can't find a link at the moment, but I believe choline is anti-dopaminergic. I feel very lethargic after breakfast and I just realized that the culprit is probably the two eggs, so you're not alone.
The fat in eggs makes me lethargic, but after the cholesterol is filtered, I can think like I've had 10 hours of sleep. Taking lecithin gives me great cognition and clarity without the slump. It cures sleep-deprived vertigo, and it even helps me focus. I honestly have not seen any evidence of eating natural forms of choline causing a decrease in dopaminergic activity. In fact, I see the opposite.
AChE inhibitors are a completely different story, which upset the methylation and citric acid cycle.