Silver is often maligned because of the slang term for Mercury - Quicksilver, and it's use in Dental fillings - Silver-Zinc-Mercury Amalgam.
Also, I've seen some make your own CS sites for plants that used silver coins for the electrodes. Silver coinage for the most part is 90% Silver and 10% Copper. If one were to drink that, it could very easily cause the other problems you sited, as Copper is toxic to humans in more than trace amounts.
Silver has a long history of medical use, before Coal and Petroleum derived antibiotics, it was commonly used to cure many bacterial and fungal infections. It is still used in newborn's eyes after exposure to bacteria in the birth canal, in bandages for burn victims, to purify water, etc. It's still used in plate and Silverware, Jewellry, as well, wouldn't think that would be true if it were so toxic.
I've used CS for about 7 years now. I know folks that have used it for more than 20 years. None of them are gray, blue, or neurotic. If it was going to affect me or them, in any of those ways, it would have shown up by now, don't you think?
Do you eat Apples, BTW?
Carolyn