Hi!
have you thought that your vagina might be too dry? During your period, because of all the blood it becomes kinda "lubricated" and rubing against underwear doesn't annoy you. But after your period there is nothing there to protect it so it becomes irritated.
If this is the case probiotic supplements (e.g. Accidophillius) and a lactic acid based soap might help. Don't use any kind of soap with artificial colour and odour.
I hope I've helped. Good luck!
I am having the same problem. Mine has been for years now also. I get server burns and itches from discharge. I Do not feel none of that during my perios. Sometimes i cry. It is that painful! I have been to ever doctor. and NOTHING shows up on ltra sounds, urine tests, blood tests, paps, std checks.. NOTHING.. and they say im fine.. buh I no im not fine!... if anyone can help and give any infomation on anything that may help, it would be greatly appreciated
Thanks