Boric acid uk?

Hi, I've had a very bad bout of thrush/yeast infection for over 2 months now and everything I've been prescribed hasn't worked, or it does for a couple of days then it comes back. I keep seeing people recommend boric acid but I don't know if you can buy it in the UK? Does anyone else have any other suggestions with how I can get rid of this? I'm in complete misery every single day, I can't walk without discomfort and itching, I just want my life back😔