I think you should see a dermatologist, for starters. Lots of people have itchy legs, usually from dry skin, but I can't think of any direct relationship between the leg itch and the symptoms near the anus or vagina. None of this sounds sexually related, nor can I associate the vibrator with anything expect perhaps the
vaginalAnterior vaginal wall repair
Causes of vaginal itching
Culture - endocervix
Hydrocele
Hysterectomy
Transvaginal ultrasound
Vaginal bleeding between periods
Vaginal bleeding during pregnancy
Vaginal bleeding in pregnancy
Vaginal cysts
Vaginal discharge symptoms. Meantime, I would moisturize your skin with any lubricating lotion (Lubriderm, etc.), and you might also try an itch lotion containing camphor or menthol. (No prescription needed.)
I don't think you have anything to worry about; a skin doctor should be able to supply the reassurance and treatment you need.
Best.
Dr. Rockoff