This is quite an interesting thread with mixed opinions about Black Magic (Sihr)..
Black Magic/Nazar/Bandish...It is all real and is extremely serious and for no reason should be taken lightly or ignored. Indeed Black Magic/Sihr was done on our beloved Prophet (saw) and then Surah Al-Nas and Surah Al-Falaaq were revealed. So we already are aware of the treatment. Also, as I have been told after every salat you need to recite Ayatul Kursi. Recite the ‘4 Kuls” as well. Surah Al-Kafiroon, Al-Nas, Al-Falaaq, Al-Ikhlas before you go to sleep.
Why would Allah allow it to happen on our Prophet? It goes to show that Evil does exist in this Duniya, and there are people who can abuse their power to harm others or to satisfy their own personal desires. People who think it simply does not exist are denying Ayats from the Quran and prophetic Teachings..hence it is being unintentionally ignorant of something so serious.
We know that as a True Muslim Believer, our strongest weapon is Dua'a. (and perhaps only weapon). And to constantly remind ourselves that ONLY Allah (swt) decrees what He Wills, as He is the Most Powerful. However, sometimes people go to specific people (those who know how to perform Black Magic) that can actually do Amals and do Black Magic on people for either revenge, envy or to get their own wish to come true.
"HHS4462" : you case sounds that of Bandish, which is very serious. I hope your situation has been resolved now. Sometimes, in order to diminish the effects and to set yourself free from effects of Black Magic, you must seek external help from gifted spiritual Healers, just exercise caution that these Sheikhs/Spiritual Healers are using only Quranic verses to cure you. From personal experience I can tell you, it can affect you in many ways and Allhumdollilah there is a cure..and Allah Knows Best 
For more information, and for those individuals who can understand urdu please watch this video on "youtube"
It's 9 parts long, and I recommend you watch each part with close attention.
Sometimes we don't believe because we are not exposed to it, and I honestly pray nobody reading this experiences it.