I have once been put a spell on to bring me sadness and misery. Not because someone told me first, but I felt it. I felt the massive black cloud above me, I felt depressed for no reason and uncontrollably, my husband was weird and cold with me, and every single day I would hurt myself. I bit my lip so much, that I had a bruise and a lump, I cut my finger badly, knock my head, at the point when I looked like literally miserable and with bruises all over my face. I knew something was up, as I had just fell out with a woman, who in fact I knew that she knows a brazilian witch. So I realised straight away that she had done something, I confirmed it with a psychic, and I was right.
For someone to have done such thing to you, you must be feeling it, not because someone told you. Maybe that person told you because they expect you to give them money to "clear the curse", that probably doesn't exist.
Also, I believe that if you're not vulnerable to it then it can't get you. It only got to me, because I left myself vulnerable to it, but after a deep cleanse I promised Myself to always have a strong mind and never let anyone control my life. Negative spirits and these curses and hexes ain't stronger than us. We are so much more powerful than we think.
Let me know how you get on, or inbox me if you need. By the way, I didn't cleanse it myself, a psychic did it for me. And I don't know want she used. But just google "Breaking a curse". I think anything will work if you keep a strong mind and believe it.