Wifezilla
Low-Carb Queen - RIP: 1963-2021
I bet it is the sulfides. I avoid all home made wine recipes that call for Camden tablets. http://en.wikipedia.org/wiki/Campden_tabletsSomething in wine makes my heart race in a very unpleasant manner, just a sip or two will do it. It's kinda scary.
If you boil your wort, you really don't need them.