Here is a good link from kellymom about mastitis. http://www.kellymom.com/bf/concerns/mom/mastitis.html
Hopefully you saw a breastfeeding friendly doctor or midwife. The big thing is the keep breastfeeding, especially from the affected breast.
Hope you are feeling better soon!
I would go to your regular doctor or OBGYN/nursemidwife tomorrow. They may want to get you an antibiotic presciption (usually dicloxicillin, safe for breastfeeding).
Until then...hot compresses, hot baths/showers, pump to make sure breast is being emptied completely after nursing, take the homeopathic remedy phytolacca decandra, nurse in various positions, extra rest. You're probably not feeling a letdown due to being sick/tired, but that doesn't mean your baby isn't getting enough milk.
I hope you feel better soon! But I wouldn't rush into an ER visit unless you are running a very high fever. You be the judge of how you feel though!!
Sorry you're in pain!!! s
2/01, 12/02, 4/05, 7/06 and 10/08
GO TO THE ER because you mentioned red streaks in your breast! That could be blood poisoning and that requires IMMEDIATE attention. I just got out of the hospital for the same thing. I waited too long and they kept me for 2 nights and 2 days pumping me full of Clyndomiacin and Dilaudid. Don't do what I did. GO NOW. You won't be sorry. Take care and let me know how you are now. Emily