Apparently there is a disorder associated with extreme infatuation that can cause detrimental health effects.

https://en.m.wikipedia.org/wiki/Limerence

"The physiological correlations of intense limerence can include seizure-like trembling, pallor, flushing, heart palpitations, pupil dilation and general weakness. Awkwardness, stuttering, shyness, and confusion predominate at the behavioral level. Less common effects include insomnia, loss of appetite, and passing out."