electrical pulses occur when the nerve carrying sensation from that area is pinched or affected in any way
some possible causes:
1- Infection of the nerve can cause the sensation.
2- A spinal cord herniation or degeneration of the spinal bones is often associated with vibration of the muscles of the vaginal area.The nerve supply comes from various nerves all of which originate from nerve fibres from the lower spinal cord.
3-Neuropathy due to diabetes or due to vitamin B deficiencies can also cause these sensations.
consult your doctor ask to be examined to rule out or confirm any of these causes
you can do slow stretching exercises. Take multivitamin supplements containing Vitamin B1, B6 and B12 also helps.