Q. How does one know when one is affected by black magic and how can it be removed?
A. This can be known through the strange experiences and nightmares that one may have. In order to remove this, one can recite verses of the Holy Quran and duas which are effective in removing black magic. It is also permissible for one to attend to a sound and reliable person who has some knowledge of this. Through his help and assistance, one can be relieved from this problem, Insha Allah.
And Allah knows best.
Mufti Waseem Khan