What Causes Itchy Rash And Green Discharge In Vagina?

Hi doctor I am a 28 year old woman, I think I have 8 years living with this pain, it stated with small itching rush in my vagina then develop to a green discharge. I went to the hospital they treated it, after That I experience lot of discharge if I happen to stay with it for some time it develop to an itching rush
Please help what should I do I tried all but nothing seemed to work