It would be very unlikely for you to have o.c. at your age. Try improving your diet, drink more water, eat more fiber, and go for a 30-min walk every day. This can help clear up most of your symptoms. If you see a doctor, it will be at least $100 just to see them, then several hundred more if you have any lab work ordered.
Take Advil or Aleve for your back pain. If your white discharge is chunky, it could be a yeast infection so go to Walmart and get some Monistat to treat it.