I can't believe how many doctors prescribe treatment for just the baby when they have thrush! - My HV has always made sure I have had both the oral gel and the nipple cream for me to ensure we aren't cross infecting as the first few weeks we were constantly cross infecting each other and I could not completely clear it up. I now have both the Daktarin oral gel and Daktarin Nipple cream (Miconazole Nitrate). I have had Nystatin prescribed in the UK but hated it because it flushed the thrush through to her bits. Obviously it works well for others, but personally I didn't like it and it stained badly too, so try and make sure your LO has a bib on when administering it.
-I can't imagine there would be any problem using the Nystatin on your nipples as I was told to use Frankie's oral gel when there was a delay on ordering my cream...But if you do start exhibiting symptoms of thrush I would pop back to your GP or HV and ask for a prescription. Failing that you can get a Miconazole Nitrate cream over the counter at a Pharmacy.