Hello
Thanks for writing to us with your health concern.
You have the answer in your question itself.
3 days of almost constant sex without a lubricant would lead to friction and hence the pain .
THis is the most probable cayse.
As you say, you have done this earlier, but this time it is more severe.
you could have lacerated or abraded some part of the labia in this case.
Right now just take it easy.
Avoid intercourse for a few days.
APply
aloe vera gel and
cold compresses to the area.
Wear loose cotton undergarments.
Do not touch, rub, scrub or vigorously clean the area.
If the itching and pain does not abate within a couple of days, please schedule an appointment with a gynecologist.
This would be to exclude the possibility of a
vaginal infection.
Also avoid shaving for the time being.
All the best and take care.