Hi on Wed I woke up and my left breast felt sore but as the day went on it became red and as i touched it and rubbed my hand over towards the nipple it felt really hard. I felt hot that evening and shivery and really tired. Went to the doctors yesterday and she said it is mastitus but I am 45 yrs old. She has given me Flucloxacillin to take for 5 days but from what I have read of my symtoms I am a bit worried. What do you think?