Recurrent thrush may also be because there is a second bug in there that makes it easy for the thrush to reinfect, or causes some of the symptoms itself.
There are combined medications (kenacomb is one) that are both antibacterial and antifungal, but I think they are prescription-only.

If you are expressing to reduce the irritation then make sure that you are sterilizing each and every time as well

hugs
kate