It can be a genuine black magic problem but your story creates the doubt. Why you did not give examples of black magic you are experiencing to clear the doubt rather than telling tv/film/media examples. If you go to any Aghori and tell him which mantra you are chanting, he will obviously advise you to pray his deity.

Again, there is wrong perception that doctor based on his experience can figure out everything based on whatever little you say. He will ask/check more to know exactly what happened.

No point in closing the door to any possibility because in black magic many other things also take place which you did not disclose.