Hadith from Sahih Bukhari
Narrated Abu Said: Some of the companions of the Prophet went on a journey till they reached some of the ‘Arab tribes (at night). They asked the latter to treat them as their guests but they refused. The chief of that tribe was then bitten by a snake (or stung by a scorpion) and they tried their best to cure him but in vain. Some of them said (to the others), “Nothing has benefited him, will you go to the people who resided here at night, it may be that some of them might possess something (as treatment),” They went to the group of the companions (of the Prophet ) and said, “Our chief has been bitten by a snake (or stung by a scorpion) and we have tried everything but he has not benefitted. Have you got anything (useful)?” One of them replied, “Yes, by Allah! I can recite a Ruqya, but as you have refused to accept us as your guests, I will not recite the Ruqya for you unless you fix for us some wages for it.” They agrees to pay them a flock of sheep. One of them then went and recited (Suratul-Fatiha): ‘All the praises are for the Lord of the Worlds’ and puffed over the chief who became All right as if he was released from a chain, and got up and started wAlking, showing no signs of sickness. They paid them what they agreed to pay. Some of them (i.e. the companions) then suggested to divide their earnings among themselves, but the one who performed the recitation said, “Do not divide them till we go to the Prophet and narrate the whole story to him, and wait for his order.” So, they went to Allah’s Apostle and narrated the story. Allah’s Apostle asked, “How did you come to know that Surat-ul-Fatiha was recited as Ruqya?” Then he added, “You have done the right thing. Divide (what you have earned) and assign a share for me as well.” The Prophet smiled thereupon. (Book #36, Hadith #476)
Narrated Abu Said Al-Khudri: Some of the companions of the Prophet came across a tribe amongst the tribes of the Arabs, and that tribe did not entertain them. While they were in that state, the chief of that tribe was bitten by a snake (or stung by a scorpion). They said, (to the companions of the Prophet ), “Have you got any medicine with you or anybody who can treat with Ruqya?” The Prophet’s companions said, “You refuse to entertain us, so we will not treat (your chief) unless you pay us for it.” So they agreed to pay them a flock of sheep. One of them (the Prophet’s companions) started reciting Surat-Al-Fatiha and gathering his sAliva and spitting it (at the snake-bite). The patient got cured and his people presented the sheep to them, but they said, “We will not take it unless we ask the Prophet (whether it is lawful).” When they asked him, he smiled and said, “How do you know that Surat-Al-Fatiha is a Ruqya? Take it (flock of sheep) and assign a share for me.” (Book #71, Hadith #632)
Narrated Amir ar-Ram: We were in our country when flags and banners were raised. I said: What is this? The (the people) said: This is the banner of the Apostle of Allah (peace_be_upon_him). So I came to him. He was (sitting) under a tree. A sheet of cloth was spread for him and he was sitting on it. His Companions were gathered around him. I sat with them. The Apostle of Allah (peace_be_upon_him) mentioned illness and said: When a believer is afflicted by illness and Allah cures him of it, it serves as an atonement for his previous sins and a warning to him for the future.
So please be patient and ask sincerely Allah (swt) to cure your ailments.
I know that in the case of illness(for pain) you place your hand in the area you feel the pain and say:
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.