I agree, I had trouble with my providers not knowing how to treat a breast yeast infection, and that you and your baby must be treated at the same time. I suggest contacting your local La Leche League leader http://www.llli.org/Web/Kansas.html, they will have many suggestions, there are many ways to prevent candida (the fungus that is yeast) and to stop it from spreading. Also, there is a lot of good information out there, such as on Dr. Jack Newman's site, http://www.drjacknewman.com/help/Candida-Protocol.asp. I know how painful it is when you have yeast and are trying to nurse. Don't stop pestering your doctor until you are satisfied. Often yeast comes after taking an antibiotic (I am not sure why you are taking one), just as some women get vaginal yeast infections when they take an antibiotic, so if you know you need to take one in the future, you may want to take some precautions such as taking a pro biotic (yogurt or acidopholis in tablet or capsule form), wiping your nipples and your baby's bottom with a vinegar/water solution (I think the recommendation is 1T vinegar/1c water), changing your breast pads frequently and airing out your nipples, etc.
If you can afford an Rx, I recommend the "Dr. Newman's All-purpose Nipple Ointment" as recommended on the site (and by LLL), not only does it help prevent and get rid of yeast, it is safe for your baby and it REALLY helps with the pain.
My first daughter and I battled yeast and passed back and forth for 9 painful months. I wish I had been more forceful and persistent with my doctor. With my second, I got yeast, but we knew what to do and I insisted upon it, and though it was awful, it was not a constant battle.
I hope you find some help.
K.