The vet says my ferrets have two weeks to live?

I've had several adrenal ferrets - your ferret definitely has adrenal gland disease - not cancer. Go to a better vet and get your ferret the surgery it needs to remove the gland or if you can't afford surgery (mine were around $600-$700) there are medications for this. P.S. the vagina always swells on female ferrets with adrenal disease - this will go away with the meds or surgery)