Help! I need answers...

Does anyone know why someone would feel throbbing (like an orgasm) in their vagina and itching around the opening of the vagina when they pee? It’s been going on for about a week now and idk what could be causing this to happen. I also feel like I have to pee 24/7 even when nothing comes out. My parents think it might just be a bladder infection but I’m not sure. Can someone help?