Hi there.
The most likely cause of your symptoms is chronic/recurrent yeast infection, or irritant vaginitis (more likely, I think). Vaginitis just means inflammation of the
vaginalAnterior vaginal wall repair
Causes of vaginal itching
Culture - endocervix
Hydrocele
Hysterectomy
Transvaginal ultrasound
Vaginal bleeding between periods
Vaginal bleeding during pregnancy
Vaginal bleeding in pregnancy
Vaginal cysts
Vaginal discharge/vulvar area.
I'm not sure if you've been examined, or have had swabs and had yeast ruled out. If it is yeast, it may be easily treated with an anti-fungal. But some
womenWomen's way get
recurrentRecurrent cystitis infections that leave when treated and come back, or never fully resolve- sometimes they have yeast that is resistant to the typically used anti-yeast treatments.
Because you didn't mention related
dischargeAbnormal discharge from the nipple
Ear discharge
Eye burning - itching and discharge
Nasal discharge
Nipple discharge - abnormal
Urethral discharge culture
Vaginal discharge, and because it comes at the same time every month, this makes me think that it is more likely irritant vaginits (although you can have yeast without notieable
dischargeAbnormal discharge from the nipple
Ear discharge
Eye burning - itching and discharge
Nasal discharge
Nipple discharge - abnormal
Urethral discharge culture
Vaginal discharge, and it would probably be hard to tell since you are on your period anyway). It is common that recurrent burning/itching is wrongly diagnosed as yeast when it is due to irritation from something you are coming in contact with. Often things present in creams, lubricants, spermicides, scented sanitary products, douches, soaps, bubble baths and condom lubricants can be cause symptoms like yours.
Try to be particular about figuring out if there is something that you are coming in contact with each month- most like a pad or scented spray or something. If you eliminate that possibility, you should see a Gynecologist for an exam to rule out yeast and other skin disorders.
Hope you're feeling better.
JMK MD
It's certainly possible that the pain you're having during sex could be caused, or at least made worse, by the anticipation that it's going to be painful. But it also sounds like you are having burning and pain during your period aside from during sex.
I still think it's possibly a contact-irritation thing, especially if your doctor said you don't have an infection. Hopefully you will find that it is something like that, that you can change and notice a big improvement.
Good luck.
JMK MD