Ups and Downs By Kundalini Process

To give up your accustomed-to small ego to a bigger Ego, activated by Kundalini, is exactly what triggers ups and downs. You are, in it, dying in the small ego, and reborn in the bigger ego.

Bonnie Greenwell can give you some insights with her book called "Energies of Transformation, A Guide to the Kundalini Process", and her HPs are as below.

http://www.kundaliniguide.com/
http://www.awakeningguide.com/