If your gynecologist says you need to have electric shock therapy on your vagina how do they do that?

Electric shock? I assume they are talking about helping to strengthen the pelvic muscles to help retain the vaginal tone. The electrical pulses cause the muscles to contract--keegle exercises. Check out www.Intonemedical.Com.
Incontinence. I am assuming you need treatment for incontinence. Using electrical stimulation (not necessarily shock) can help women learn which vaginal muscles to use to stop their urine stream and tighten the vagina (kegels) pelvic physical therapist use this and there is a device available for doctors to prescribe that they can use at home.