Try coconut oil. A lot of lotions can cause irritation and problems, natural oils are much better. Coconut oil is amaizing and it has antibacterial properties.
Its sounds like you could have a yeast infection down there, thrush the most likely cause of itchyness if you havnt recently shaved ur bikini area. It explains the itchyness everywhere & cant be treated with over the counter medication typicaly a cream from your pharmacy. Best of luck hun. Otherwise a visit to your Dr wouldnt hurt if it persists