1. Yes. But don't be surprised if baby doesn't want to nurse- the milk on that side may not taste all that pleasant.
2. Mastitis can come on very suddenly- I just had that experience. Less than 24 hours between first noticing a plugged duct and seeing red streaks.
3. You can probably go indefinitely without getting an antibiotic as long as you feel that things are trending towards getting better and not worse. But honestly if you have pus-y discharge and a fever and chills, I think it makes sense to at least see the doc and get a scrip for antibiotics, because that sounds pretty bad. You don't necessarily have to take the abx if you feel like you're getting better, but if you suddenly start to feel worse you want to have something in hand, and not have to wait for an appointment and then wait for the pharmacy to be open...
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"