It's probably gone down by now but I've had this many times. It usually happens when I have a yeast infection but it has happened just from irritation also. It has only happened to one side at a time and lasts several hours. Mine has swollen so much at times that I couldn't walk. Some people might think they could never swell to 5x their size but they sure can!! I showed my husband once and he freaked out
It looked like I had a testicle!!
Anyway, I put a cool wash cloth on it, lay down, and it goes away with no lasting effects.