From personal experience I would recommend using Yes lubricant daily as a barrier cream, a little goes a long way and provides lasting comfort from persistent soreness and that associated dry feeling. You can buy it online and it’s reassuring to read their website and the reasons behind it being created.
I would recommend washing only with dermol or another soap substitute and making sure your shampoo etc cannot come into contact with intimate areas when rinsed.
Wash underwear in washing powder only at a high temperature, no fabric conditioner and rinse twice.
Limit wearing tight trousers and any activity that causes friction such as running.
The above is general maintenance advice and you are probably already doing this and more as you have been surviving this pain for 8 years.
I would consider seeing another vulva dermatologist. I had a biopsy on my vulva skin which came back negative and therefore confirmed I had nerve pain. This was when I was finally able to get the correct treatment.
Things that have worked for me are gabapentin then switching to pregablin, concurrent use of nortriptyline, citralopram for the associated anxiety, CBT, yoga, acupuncture and acceptance.
Acceptance that this is the situation as things currently stand but not acceptance that this is the way things will always be.
It’s a chronic condition and has got easier to accept and manage over time. I can now walk for miles even if I can’t run, I am much stronger through yoga even if I can’t go swimming, I can curl up with my children and read a book / watch a film even if I can’t cycle with them. And that’s okay. I try and remember to be grateful for what I do have and what I can do, rather than what I can’t.
Keep going OP, it took a long time to get my diagnosis. No one believed me. I spoke with NPs, numerous GPs, various gynaecologists until I met an amazing dermatologist who started to turn things around for me. You shouldn't have to push for answers but do keep pushing - this is the first time I have spoken about my condition as I couldn’t read your message and not respond. I understand how hard it is to get the correct care and treatment but there are people out there who can help you.