What is the Islamic ruling regarding wearing charms or amulets?

Is wearing taweez/charm/amulet haram? What does the Holy Quran or Hadith has to say about it? What does the scholars say about it? --- To elaborate, I got sick and was about to die and went to doctors. Then I took alopathic and homeopathic medicine but none helped. My brother suggested me to go to a Molvi who asked me to sleep flat and recited some verses of the Quran and I who was at no hope felt that I was back in life at that very moment. Later on he gave me a amulet/taweez and asked me to wear it because according to him I was afflicted with black magic and ever since then I have been wearing taweez and I haven't felt anything bad yet. So I am wearing taweez just to thwart that black magic done to me because of which I was almost always sick with some or other disease and getting weaker and weaker. (Please pray for me if you can, thanks)