There are some Women's Health Physios that use Ultrasound to treat mastitis - very effectively. Often only need 2-3 doses if treated early.
I do hope your problem has resolved and that it didn't turn out to be an Abscess. if in doubt and still have fever symptoms on antibiotics get to your local emergency department for a full check up and possible diagnostic Ultrasound of the breast.
Cheers. www.vanea.com.au