I've also had a recurring problem with a sinus infection.
Two nights ago after reading the reflexology chart shown left (I've been undertaking energy work on my feet with an advanced healing tool) I realised that the fungal nail infection coincided with the point on the big toe attributed to the sinus.
I applied some anti-fungal cream onto my big toe. Next morning my left big toe nail was clear of the infection. I've not had blocked sinuses since; either. Coincidence?
