What Causes Vaginal Pain And White Mucus Discharge?

i am 42 year old women and before 1 month i feel eching sensation in vaginal portion and white mucus on vaginal portion after consulting dr.she give me 1.condistate od for 3 days afterwards doxt 20 days,femifort 20 day,afterwards ecoflora bd for 15 days but after making contact with husband again burning sensation in vaginal portion happened dr. please help what can i do now