I certainly hope that you have been helped by now!!
Diflucan is good but more for systemic fungus infections but should have worked for thrush.
I think Nystatin mixed as a gargle is probably the best for oral/ gastro candida infections.
Also, the unfriendly bacteria has to be replaced with good friendly bacteria that is in probiotics supplements like Culturelle, L sporogenes, PB-8, Primal Defense work well.
I have found no single probiotic supplements works for everyone. So, I suggest a shotgun approach-- try them all. Some re-colonize, some work with digestion and some pass through but replacement is very important.
The best yogurt I have found is Stonyfield Farm -- it contains 6 cultures and you can buy it Organically. Kefir is also loaded with friendly bacteria.