Dear gramo, the only way I know to free oneself from any kind of black magic is to chant the maha mantra constantly;
Hare Krishna Hare Krishna
Krishna Krishna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare
if you are fortunate enough to have sankirtan of the Hare Krishna mantra then it will be a more powerful antidote.
Always try to repeat the maha mantra whenever you feel disturbed and you will be fine.
I hope you will try this and that you will be fine, and even better
Amiyah.
Shri Chaitanya said, "One who loves me always chants the holy name"
