What is this? Really gross problem

I've posted about this before and thought it was a yeast infection, but tried Diflucan and it did nothing for me. I have a foul smelling odor coming from me when I'm on my period. I am not lying, it smells like a dead rotten bloody animal. I've also noticed now I get clumps of this soft whitish yellow stuff down there. It can't be yeast, b/c I've tried several different things for that. What could it be? I'm really needing help with this and would really appreciate any help anyone can give. I apologize for the disgusting subject matter, Thanks.