I have been having this problem for a few days now, My right vagina lip is swollen it hurts so bad that I can barely touch it. It burns when I urinate, it itches and burns all day, and I am having very lightly brown discharge whenever I wipe. What could be the problem? And what should I do?

You should visit your doctor as soon as possible before that condition becomes unbearable. We do not diagnose on the internet.

Sounds like a yeast infection. Get your doctor to diagnose it properly.