have you ever heard of this?

Biorhythms,

Biorhythms are inherent cycles which regulate memory, ambition, coordination, endurance, temperament, emotions, and much more. We each have three fundamental biorhythm cycles. Each biorhythm cycle has a particular function, and a particular life cycle.

Our physical biorhythm cycle completes one life cycle in 23 days. Our emotional biorhythm cycle lasts 28 days, and our intellectual biorhythm cycle lasts 33 days. At mid point and end point in each cycle, they sharply move back to zero point and change polarity. The day a cycle changes polarity is called a transition day (also called a critical day, or caution day).

Who knows how legit this is but my Dad is a neuro-biologist (PhD) and he says they exist without a doubt. My chart seems pretty on it. A few days ago during my "emotional transition" i felt like i lost something. That feeling is so confusing and it has persisted for the last few days.