I have never actually had a kundalini blast; they say it's the cocaine rush of the energy world. A lot of people like to trigger it with breathing excercises, and they get a steady flow of energy upwards through their body. If it continues, you'll supposedly blow your top off and through yourself off kilter.
Not that this is happening to me now, but I've been meditating on my root and my sacral chakras. Those of you who know me would probably say that I'm quiet but aloof and my mind is usually travelling the universe. I'm not always very present in my body. Anyhooo, the past few weeks I've been a lot more centered in my base, and it was finally expanding and connecting to the earth energies. The problem I have now, is that after a small emergency at work my kundalini seems to have fired up and I can't put it out anymore. I'm constantly in a state of fight/flight, and the smallest thing will set it off.
Today I was sitting with some friends, and after lunch when they all became very calm and quiet my energy went into overdrive and I had to get up and leave. Granted, I had somewhere to go, but it's like my body had this intake of food & energy and suddenly went into overdrive trying to burn it. Not sure what happened, but we'll see. Hopefully I'll chil out over the weekend, I need to ground all that excess energy into a tree and send it down into the earth, instead of up into my body. Today I felt tense, like I had a current of energy going up my spinal chord and centering in my heart. Not such a nice feeling!