Clean, clean, clean! Start washing everything in hot water with a cup of vinegar added to the wash; only wear/use bras, shirts, onesies, towels, washcloths once before washing them; sterilize all pump parts, bottles, pacifiers everyday- boil them for 20 minutes; don't save pumped milk longer than a few days; rinse your nipples in half vinegar half water solution after nursing.
Some people have luck with probiotics. I didn't use them, but maybe someone else will come along and give you some advice about that. I did cut back on sugar in our diets and eat lots of yogurt.
Good luck! What medication did your doctor prescribe?
“We are not put on earth for ourselves, but are placed here for each other. If you are there always for others, then in time of need, someone will be there for you.”