I seem to have got mastitis - DS is 6.5 months so unexpected. Saturday had hard sore lump in boob then woke up Sunday and it was worse, streaky red and I had a temp. Got to out of hours doc and got out on 500g penicillin (fluoxo something) 4 x a day, but i still don't feel better yet. Top section of boob is all red now and a bit purple :( I'm trying to feed but I started giving DS a bottle of formula mid morning for the past month so it's quite a chunk of the day I'm not feeding for. How long until I should start to feel better? I've got a 2 yo DD the look after too and it's been really tough today as I'm shivering and feeling sht. Ask scaring myself that it's actually inflammatory breast cancer, misdiagnosed as mastitis so getting a bit teary! Help! How long should I give it before i call docs?