A.P.
I'm guessing you might not be getting this until the morning,(i am checking my email late tonight) anyway I have some tips for you. I just had my first baby a year ago, but had a few issues breatfeeding. I cleared it up and made sure not to let it happen again because it was painful and I had all the same symptoms as you come on within hours.
So first off I would make sure to keep your nursing pads changed often enough (just to keep things extra clean) and if you for some reason dont have time to shower each day make sure to clean your breasts well with a warm washcloth (this may be helpful to do a few times a day either way if you are having a lot of problem)
The big thing that helps to keep your milk from clogging and having any of these other problems, as well as being healthy for you and your baby is LECITHIN. You can find this at a natural food store or any store that sells vitamins. They have it in different forms, I bought the one that was in a tall canister and looks like little chew-able granuals. You mix about 2 tablespoons with some yogurt and eat it up. It tastes yummy plus after taking this I had no other problems. Are you getting white spots on the ends of your nipples? I had this a few time and I carefully popped a small hole in the end of the white part with a sharp clean needle. then just kept it very clean every time I fed and massaged it.
IF your not already doing so a hot bath helps sooth some of the pain and massaging your breast and in case of clogging I rub the nipple with a wet washcloth. I would make the water as hot as you can stand it. I would try all this before taking antibiotics if you can avoid them, but if not then be sure to take some pro-biotics to replace all that the antibiotic kill off. These are safe as well for you and your baby. I hope you are feeling better and please let me know if you have any questions about the Lecithin. It will definitely help I hope you give it a try. You are welcome to call if it is easier than emailing ###-###-####