Could you be pregnant? Or have you recently come off birth control? You do need to see a doctor though. Good luck!
I had a similar thing earlier this year and it was diagnosed as a cyst - very simple to cure. But it could have been worse. Please go and see a doctor.
You NEED to find a way to see a doctor - unfortunately, there is no other solution to this one. A lot of places have clinics that will charge you on a sliding pay scale and others have options where you can pay a small fee every month. Please look into those options so you can get the treatment you so desperately need BEFORE things get any worse.