I would agree w/ everyone that it does sound like it could be mastitis, although it seems a little strange to get it on both sides at the same time. I was able to resolve mine by sitting in a friend's tub that had massaging jets-- very hot water-- and aimed one of the jets right on the sore/hard area. Wow, it was painful, but it resolved it right away and I was feeling worlds better the next day without having to take drugs that would pass on to my babe.
One thing I haven't seen in others comments that I read and heard from several reputable sources is that you really shouldn't wear underwire bras, day or night, while nursing because they can be a cause of mastitis. I know tons of places sell them, but try to avoid them if you possibly can. I hope you are doing better, and if not that you are really soon. Hang in there!