i responded on your other thread and wasn't sure if you got to read the links i posted there, but make sure it is liquid citricidal grapefruit seed extract, and dilute 10 drops of GSE to 1 oz of distilled water to use for swabbing your nipples and the inside of your baby's mouth. use distilled water because the chemicals added to tap water are meant to kill bacteria and can reduce the effectiveness of the GSE. swab every hour, applying with an absorbent swab in baby's mouth BEFORE nursing and on mama's nipples AFTER nursing. if the pain and other symptoms of thrush are not markedly improved by the second day, increase the concentration to 15 drops per oz or even 20 drops per oz. this is paraphrased from dr. jay gordon's website page here: http://www.drjaygordon.com/development/bf/thrush.asp
it does sound like you might have the beginning of mastitis, however, and this is paraphrased from my copy of The Consumer's Guide to Homeopathy about lactation issues and mastitis. pick the symptoms that best fit your own symptoms and use that homeopathic remedy. if no change after 24 hours, consider another remedy.
*Belladonna: when breast is very hot and sore and you experience throbbing pains. breast can be swollen, bright red or maybe even shiny red and extremely sensitive to touch and even slight motion. mother may have a fever and may show red streaks from the areola.
*Bryonia: when the condition develops more slowly. mother is extremely sensitive to any type of motion and despite breast soreness feels some relief when lying on her painful breast. cold applications provide some relief and you crave cold drinks.
*Phytolacca: when breast is hard and lumpy and when pain wanders to other areas of the chest or other parts of the body.
*Silicea: heal old lumps of abscesses in the breast.
if you choose to try and treat yourself homeopathically or otherwise, i would highly, HIGHLY, *HIGHLY* recommend consulting a lactation consultant as soon as possible for an evaluation. they are well-trained individuals specializing in lactation problems and have undoubtedly seen and been educated in the many ways women have successfully treated different types of cases of thrush/candida/yeast and mastitis. see someone AS SOON AS YOU CAN, because although i don't want to scare you, mastitis can really knock you down and it can end you in the hospital with iv antibiotics and iv fluids and that is really no fun.
sending you healing vibes...