It may not be vulvodynia. unfortunately not enough research has been done on womens' problems like this condition.
i have similar symptoms (the vulval burning during and after sex) i dont think its vulvodynia. my doctor told it could be a general irritated vulval syndrome. she suggested not using any soaps at all when washing the area so now i just use warm water and that has eased the symptoms.
try an aqueous cream after sex or an anaesthetic cream to numb the area before sex....so while you may not get the full sensation, the sex wont be as uncomfortable.
As far as i know, Vulv-d doesnt effect your conception chances, however, you mentioned burning after your partner ejectulates into you. it may be worth asking for allergy testing and unfortunately that can effect your chances of conception....but remember it could be many things. go see a gyne and if they say they cant help you then keep trying. i know i will until i get some answers, but i think this is something i will just have to live with.
I hope you find some answers and good luck.
It doesn't sound like vulvudynia to me. I would go to a different gyn though. A papsmear will not always catch infections. You need some other test to see if you have a infection. I am not sure about a cyst rupturing and your chances of conception.