Picture your hormonal cycles during your reproductive years as a kiddie-roller-coaster. You have predictable peaks and valleys, generally in regular intervals. If you track your periods during this time, they are usually the same length of days from the start of one cycle to the next.  Enter perimenopause. Your adorable kiddie coaster is now one of those heart-stopping, stomach-dropping loop-de-loops. At one time, you could predict that one week out of the month when you had to pack your bags and move to a deserted island with a stockpile of tampons. Now, it’s as random as the wheel of fortune spinner with no polite warning!