It is an awful condition.
I was diagnosed in 2018 and was prescribed Dermovate Steroid and moisturiser. Never been told to use medicated wash and I'd be a bit hesitant about that to be honest.
Mine was never itchy as some people say it is, just a raw soreness/burning.
I quickly went into remission but still had some soreness, even now although it usually feels fine if I get stressed it can become sore. I saw a pelvic floor physio who said that this maybe because my brain was anticipating the soreness and my pelvic muscles responded by tensing up. If I am busy gardening/exercising or concentrating on something it usually goes.
I now am on a maintenance dose of Dermovate Steroid Ointment twice a week and moisturiser after every wee.
There is an excellent facebook group Lichen Sclerosus UK support group for women which is worth joining as they have so much info on there but here are just a few random things that I found helped me.
Don't have hot baths - showers are better.
If you do cheat and have a bath (I do sometimes) don't use bubble bath. Some people say Epsom Salts/Dead Sea Salts are ok.
Don't wear tight trousers - anything with a tough seam isn't great.
On Amazon they sell things that look like gel sanitary towels - they are normally used by women who have just given birth and go in the freezer. Nice and cold and ease the soreness. Or in an emergency a coke can that has been in the fridge - just try to remember not to offer it to anyone else after.
A doctor said if I was particularly sore I could use Lidocaine (need prescription) or EMLA (from chemist). Both are numbing creams. I use occasionally. Stings at first but then numbs.
Some people take Amitriptyline for nerve pain. I tried it and helped me to get a wonderful sleep but didn't really help with the soreness so I stopped.
Sometimes vaginal dryness can co-exist especially if you are of menopause age. There are all sorts of treatments you can discuss with GP for this once LS is under control.
Are you having follow up appointments? You should just to have someone keep an eye on things until it settles. I was under the Vulval Disorders Clinic in London for years as there is a higher chance of Vulval Cancer in women with LS and this terrified me but they say it is in remission and I feel I can manage it on my own now.
I can remember the early days and feeling such despair. I really hope yours settles soon.
ps. double check out the medicated wash as I have just googled and got this response: "No, you should avoid using medicated, scented, or antibacterial washes on your vulva when you have lichen sclerosus (LS). The skin with LS is already very thin, delicate, and prone to tearing. Medicated or harsh intimate washes can strip away the skin's natural moisture, leading to severe irritation, dryness, and worsening of the condition"
If you have any particular questions I'd be happy to answer.