I'm only a teen and last night I ate pepperoni pizza (I promise its relevant) and later that night I had really bad acidic diahrea followed by an upset stomach. A few hours ago i had a really bad stomach ache and i had the same problem but now after the fact my vaginal lips are burning like my anus was. I've taken a warm and cold washcloth and gently rubbed the area and i dont have any stds or stis (sorry for all the personal info but i think its necessary... sorry, I'm new to this) any advice or suggestions are greatly appreciated