Cracked itchy bleeding nipples ? Help!!

Ive been dealing with this for like 4 months now. I went to the doctor last week and she said its possibly thrush but doesn’t know for sure so prescribed a thrush cream to use for one week. It didn’t help.. I’m not sure what to do ? I’m breastfeeding my 5 month old daughter and she doesn’t have any signs of thrush..just a whitish tongue which I heard is normal in babies.