Breast infection when not breastfeeding!

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Has anyone had this?

I felt a large lump in my breast on friday and over the course of the day started to feel very ill, very red, hot swollen breat and flu like symptoms. Went to out of hours surgery and was prescribed Fluoxicillian 500g 4 times a day.
Was told that after a week to return to doctor who will refer to breast clinic if everything had not returned to normal.
Although i am feeling so much better,breast now looks almost normal, no redness, temp ,there is a lump about the size of a satsuma in there.
Trying not to worry, but difficult.