Based on my own experiences, I'd say Colloidal Silver most definitely affects flora.
Having said that, at first glance, it appears as though many of your symptoms are linked to blood Sugar chemistry. Though they could just as well be the result of other mineral depletion as well. ie. it isn't uncommon for Candidas sufferers to experience electrolyte and various other imbalances due to malabsorption.
Having said that, are you taking anything to to help rebuild your intestinal flora?
The simplest and best method to control Candida is to starve it. To which I'd add, sounds much easier than is done. It's slow and its hard to do, but it works.