What Causes Colorless Jelly Like Discharge After Mensuration?

hi! i am 30 years old , hiv + , 1,59m tall, 61,2 kg. for 2 years now i have been having this vaginal discharge ( thick white discharge and few days after menstruation i have a colourless jelly-like discharge ) . it goes away for few days and after two weeks of finishing my antibiotics it comes back . sometimes my vagina is itchy. i just want to know how i could get rid of this discharge for good and also i am no longer enjoying sex because of this. i also just want to know if coke ( coca cola ) contributed to this because i am addicted to coca cola.