Aww, sayang, this is SO common dekat third trimester! Hormones boleh cause darkening and itching down there, a few of my mum friends went through the same thing masa 36 weeks onwards. The darkness biasanya balik normal after delivery, don't worry! For the itch, try wearing loose cotton underwear, avoid tight pants, and pakai warm water saja when cleaning (jangan harsh soaps). But since it's driving you crazy, better check with your doctor or midwife just to make sure nothing else going on, sebab they can give you safe creams to soothe it during pregnancy, takkan lama lagi dah nak bersalin!