Greetings..
Unaccustomed to Kundalini energies they will sometimes feel like a mild, warm adrenaline rush (sometimes like a major adrenaline rush), but.. with training and discipline one can use these energies to enhance many aspects of life and the Martial Arts.. Many references to "illusion" but, i cannot know what "you" experienced.. the only "illusion" i am aware of is to search elsewhere for what is already within..
A useful exercise is to use your will/intent to try and collect this rising energy into the Dantien region.. if you are successful, you should notice that your Grand Circulation seems more noticable, more vibrant.. Once comfortable with that, try bouncing the energy off the ground, lead it down through the legs into the feet (root), pick up some earth energy on the bounce and lead it back up into the Grand Circulation (or whatever activity/application you are currently focusing on).. The greatest difficulty i used to face was the distraction of the sensation, it would pull me from the focus of the meditation.. just spend some time appreciating the nuances of the sensations so that you are comfortable with it before trying to harness it.. During Tai Chi if you sense these energies, try to lead them into the movements, let the energies excite the muscles.. if you are successful at moving these energies smoothly along the intended movements and your alignment is good the muscles will fire in a unique pattern producing a magnificent whipping motion..
There is some commentary regarding what you "think" you experienced, but.. that is all we have, our mind, to conceptualize the experience, to examine it and evaluate its worth.. it is true that we are not what we "think" we are, we are that which does the "thinking, but.. what we "think" we are is the feedback we give the "thinker (think about it ).. All in all, many of us will comment on "your" experience, based on "our" experiences.. there is wisdom in listening to others, there is enlightenment in listening to yourself.. Enjoy this new experience, it's yours...
Be well...
TaiChiBob.. "the teacher that is not also a student is neither"