Itching!!

Hey, the last couple of days I've had realllyyy bad itching down there, and it's so sore also because of scratching it so much! I had oral sex with my bf about a week ago but this has only come up in the last 2 days so can it be from that? Is it a yeast infection? Do I have to go to the doctors because I'm scared to hahaha, I don't want to talk to them about my vag problems haha please help :// btw I don't know whether to tell my mum if it's something that won't go away without a cream or medical help and it's soooo irritating but she doesn't know I've had oral sex so ??? What do I do???? Thankyou so much!