When you say you lost you voice for about 6 days; did you just continue treatment or did you take a few days off and restart?
I will start treatments for 3 or 4 days. Then loose my voice, have severe dry throat, some swelling (feels like there's a lump in my throat). This makes taking pills difficult. It takes several days for my throat to recover. The I'll restart treatment, only to have the same side effects to reoccur.