To second AnnieBrooke's opinion, make sure you're not using scented ANYTHING in the way of feminine hygiene products. Cotton panties are pretty good as-is for aborbancy, breathability, and the ability to wash... er, sort of. I have tried using a small paste of baking soda, and / or borax to remove stains, but I haven't really found anything that worked that great on my underwear, nor on my husband's white tee's with the ubiquitous armpit yellows. That "oxy-you-know-what" stuff is pretty good, but be careful not to get your nice colours in contact with the stuff. I don't care what they say, I am suspicious of several "bleached out" spots I still blame on it! Sorry, this is not a laundry blog!
I concur with her main point as well. That is, pH is important in regulating your body chemistry. A woman's normal (typical vaginal) pH is slightly on the acidic side (~ 5.5), which is not coincidentally about the same as a DILUTE vinegar / water solution as AnnieBrooke reccommends. Neutral is 7. Above that you become alkaline, creating an environment in which many "harmful" micro-organisms thrive. Her sitz bath idea is a good one, but I personally would refrain from douching. Hope you get back to your comfort zone. Keep learning, and if you find something that works, I encourage you to share it with others. That has been a God-send for me!
It might be the panty liner itself is making things worse. I'd take a couple of sitzbaths in white vinegar and water (mostly water) to discourage itching, and also go with just regular white cotton panties for a while. Sometimes the absorbent stuff in those paper products (this also goes for babies in disposable diapers) can be very harsh on the sensitive skin in that area.
i've had discharge too. but nothing that smells strange.it is, however, a lot and its gotten to a point where i have to wear panty liners every day so i dont ruin my underwear. i'm 18 and have had periods for about 5 years or so and i haven't changed anything.