I like to visualize fire around me a lot. Base of the spine and feet, over my head, all around me, in me etc. My concentrative ability is weak so it takes a lot of time to get any results.I have noticed that when doing this for a while, especially putting a fire on each chakra, front and back, that my body and hands begin to tingle in a prickly, burning fashion. Just a little. It doesn't scare me at all. I know it is headed in the right direction. Results. I am also getting to the point where my body starts shaking/vibrating during a little. This again is not seizures/convulsions, so I know it is in the right direction. Just wondering if anyone else has experienced this, and what the next level symptoms of the fire meditation might be. Just a general guideline as there is no one size fits all. Just wondering what might be the next stage effects.