IN-48
What to say when you feel a pain in your body
Put your hand on the place where you feel pain and say:
Bismillaah.
Bismillaah.
With the Name of Allah (three times).
Then say :
'A'oothu billaahi wa qudratihi min sharri maa 'ajidu wa 'uhaathiru.
I seek refuge in Allah and in His Power from the evil of what I find and of what I guard against.
Reference: Muslim 4/1728.
What to say when you fear you may afflict something with the evil eye
If you see anything of your brother that pleases you, or of his person or of his property [then ask Allah to bless him in it] for the envious eye is real.
Reference: Ahmad 4/447, Ibn Majah, Malik. Al-Albani graded it authentic in Sahihul-Jami' As-Saghir 1/212. Also see Al-Arna'ut's checking of Ibn Al-Qayyim's Zadul-Ma'ad 4/170.
What to say when you feel frightened
Laa 'ilaaha 'illallaah!
There is none worthy of worship but Allah!
Reference: Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 6/181, Muslim 4/2208