Have a periductal mastitis causing high fever. (99.9-103.6) Can't afford to see a doctor, how can I treat it at home.?

Virtual visit. If this diagnosis is correct then you will need antibiotics. Breast infections are not that common in 22 year olds unless you are breastfeeding. If you can not see a doctor in person consider doing a Virtual visit with a doctor in your state on Healthtap now.