Hi there. You are linking the discharge to back pain? Well, that would be the kind of link that you need to see a doctor for right away as then the discharge would be due to something like an infection. if you think it is a yeast infection--- the discharge is usually thicker with a few curds or lumps in it and it is typically very itchy. They do make over the counter medication for that-- Vagisil or Monostat. However, if it is any type of infection, a doctor needs to see you and treat you. The back pain is concerning if it is truly associated. good luck
Oh, and as far as other things you can do---- never douche. That is really bad for women. Eat probiotics or probiotic yogurt, wear loose cotton underwear and change it frequently. good luck