Hi,
Go to the Dr ASAP (like now!) and get some antibiotics - you will be better in a few hours. How old is you baby now? (1 Yr?) Your little one didn't give you mastitis - but it may have happened if your breast got overly full and wasn't drained (or a too tight bra, or the way you slept - lots of things. It is frustrating to get mastitis with an older baby - but it can still happen