LNA143 is on point diamond.
your body isnt producing mucus in your vagina and that can be very uncomfortable talk to your doctor tell him/her about it they should be able to prescribe a medication for you
It could be a very nast yeast infection.If you use a douche I would get a vinegar one.This won't irritate you.The other tend to wash away the goodchemicals that fight off infections in the body.
Just as an opinionated guesstimate, It may be a urinary track infection. Although it is not painful to urinate in itself, the symptoms relate in the problem that seems to be persistant that you are having. Has your doctor suggested any possibilites of what it could be after having the tests done? I'm sure antibiotics shall clear up the burning sensation. Its best to discuss this with the doc as im sure you may have already.. Take Care and I hope this irritating problem will soon cease. anoter suggestion I may add is to buy a "douche" partically by the brand of "Summer Eve" with the original scent, that may help a bit.