It is true that many people awaken kundalini due to practices that use energy movement or healing modalities and for many other reasons, and without a clear understanding of what spiritual awakening is really about or without spiritual guidance the challenges of dealing with the energy can be more complicated. In addition even those who are seeking a spiritual awakening often have misconceptions about what this entails. Eventually it means the releasing of all formerly held concepts and perceptions and even the sense of a personal "me" who can be enlightened. No one really expects this so when it starts to happen it can be very disturbing, unless there is someone around for support who really understands it.
Enlightenment is not an accomplishment to be added to the list of things we have attained in this life. It is what remains when all thoughts and personal goals are released and we begin to experience who we are without the personal mental world that has been accumulated since early childhood and is based on all our experiences, impressions, desires and disappointments.
Freedom is freedom from "me" which means we can live more fully as just presence in any moment. We are already doing this which is why so many teachers say everyone is already enlightened, but we are overlaid with all the personal phenomena which clouds are capacity to truly experience our natural self and the stillness/wisdom/love it has to offer.
It is not uncommon in meditation for the stirring of energy or the arising of energy to occur, sometimes with heat, sometimes with bliss, sometimes just energy moving upward through the body. This may be the opening of kundalini or another phenomena called prana-tattva where the pranic energies of the subtle body are just moving and reorganizing themselves. Regular mediation eventually impacts the subtle energy field, the chemical system and the brain, as if we are slowly restructuring our internal field in preparation for the awakening it can bring.
In some people challenges arise along with this energy such as the release of old memories or emotions, or disturbances in the digestion system or heart area; in others it can be smooth and pleasant and just a gradual opening. If you can trust the benevolence of the process and listen to your heart and not be overly concerned about any phenomena the process moves more smoothly.
I have another new blog site at shantiriver.wordpress.com if you wish more of my comments on the awakening process.
Blessings to all of you.