it is great as you are feeling much power.
it is much natural to get strengthful by meditation, and anyone can experience.
meditation may person much conscious about each thing that happened around you. and being in one position, for more than one hour, will make person felt that only head is available , other body not available as i have experienced. in it nothing special. but having lot of practice of meditation make u conscious about fire. as i want to tell u the same , i have done continuous mantra japa whenever i got time and at the time in home done meditation a lot , that time, during maditation automatically mantra started in my mind continuously, and after some time i felt frightened because of feeling of all vibrations of world was coming in my back. As in my class room some person are chatting , i feel some vibrations from talk was affecting my body , mostly vibration from my back. a lot of time my heart beat was grown up.
During that period , i m doing devi mantra then after these experience , i have started ram mantra and quitted devi mantra and meditaton. then after one month i got relaxed.
that time i feel and came to know why during any sadhna strict brahmacharya and total mind pureness and calm place is required for higher sadhna.