only bleeding when i pee...pain in labia.. burning while i pee..

okay, last time i had my perioud was the week b4 christmas, 2 weeks after that i start feeling a lil pain in my left p***y lip excuse me, and also i started to burn weni pee'd, an i had sex wit my bf not thinking anything about it, and the next 2 days i start to feel more pain an it kept getting worse, an my right labia or right pelvic start lookin a little swollen it also hurt, and i should be on my period this week, an im only bleeding wen i go to the bathroom but im not peeing blood its like a period without the rush of it comin out. and i have a knot right by my clitoris underneath to the right ....,.. ive also been feeling a lil lightheaded sometimes, an a little nausea/
Can someone help me please....

thankyou..