Hi, you have mentioned as unbearable vagina itching without any visible skin disease, its called Idiopathic Pruritis, that means you get itching without any proper cause, most probably this affects moist parts like vagina, anus etc inspite of maintaining proper hygeinic measures, as there disturbance in the body in maintaining proper ph levels in the secretions to keep the part healthy, so there is either raise or downfall in the ph levels and skin either becomes dry or wets more, as a result the skin of that part irritates often without any external rash and you feel like itching and scratching very often and on doing so there develops blisters, rash, cuts, erethema etc, etc.. sometimes even burning and bleeding, its mainly due low immune levels...
Allopathic drugs lower itching for a period of time and may heal the rash and all on external applications but the healthy balance in the secretions cannot be restored to its nrml from those medicines.
Through homoeopathy immunity can be boosted and the body sets right the disturbance and body restores the imbalance to nrml
Next Steps
consult a good homoeopath in your vicinity and get treated.
Health Tips
though you take medicines personal hygiene is a must with respect to your clothing and also with your foods.