I am not sure if the tefilah is from the Shlah Hakodesh but there is a standard tefillah to be said for Ayin Hora, Nega Tzoraas – there are thirteen pesukim that begin and end with a nun, you say the first one three times. Here is the tefillah – i don’t know if it will post, you can see it in many siddurim by motzai shabbos tefilloth -hatzlcoha
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