I had the same thing for 11 months after DS1. I ended up going to a women's clinic and they prescribed me a pessary which you insert (a tablet, for about 2 weeks i think?), after this treatment i was pain free! It somehow helps to heal the scar tissue. Do try to look in to this as i had a tear and episiotomy, and stiches which were done improperly and caused the area to not heal, this treatment fixed it completely. Sorry i can't remember what it was called.