The antibiotics to be taken will be decided after examining locally dear. the dose & type of medicines will be according to severity of the problem .So be agood girl &seek dr's advice soon .sooner the treatment,lesser will be the suffering.
no specific dietary advice for pain relief.
Now as you have swelling & pain &discharge,you should clean it with warm water with dettol
or savalon. at the time of bath,&every time after toilet,+mob it dry .you should avoid sex till cured.
Routinely the same cleaning regime to be followed with clean water,even after sex.cleanliness of both partners is a must.Doushes should not be done unless medically indicated.