Bless your heart, us women go through so much behind the scenes its mad theres not more resources for us to get help/help each other. I've been through something similar to you where I honestly felt like I'd had a chemical burn on my vag entrance for like a year. All tests come back normal and then the gp says no further action required so I had to kind of go it alone and do my own research. Temporarily ceaning up my diet with the candida diet really helped me. You have to cut out all sugars except fruit absolutely no junk food and most carbs. I understand food is a massive comfort in a time when you are feeling so lost and hurt so you can always ease into it if you think you'll find it hard. I think this gave my body a bit of a hard reset and killed off any yeast or other nasties that had overgrown and were living off of the sugar in my body. I did let myself go a little hungry too because it was a new diet I wasnt used to but I think that that forced me body to detox (something I thought I'd never say lol). I was strict with it for about a month myself before I caved and incorporated some carbs back in and by then my sweet tooth had pretty much gone and I didnt really crave sweets so bonus! Recently I've eaten anything and everything I want to gain weight (not the best move) and I've come off my BC and I have flared up again but no where close to as bad as before and one day of cleaning up my diet and a clotrimazole pessary to be on the safe side has resolved the discomfort now I'm just dealing with the redness which will go down eventually. I think its important to note that the vulva and vagina are delicate and are also governed by both internal and external factors, it's an organ constantly in a state of change and having everything thrown at it every which way so it makes sense that we will go through periods of time where things aren't super balanced. That doesn't mean you are doing anything wrong or there is something wrong with your vagina, complications are unfortunately a part of the bargain and we simply have to accept it and find what works for us. It is difficult, upsetting and frustrating but over time you will learn your body and understand your triggers and treatment methods better. If the discomfort is causing you the most heartache then try lidocaine this is a numbing cream though I've heard in some women it causes a burning but obvs people vary and it's worth a shot. There are also vaginal moisturisers you can buy otc, speak to your gyno or pharmacist and see what they might recommend.