All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
First of all, all perfect praise be to Allaah, who saved you from that group because most of the Sufi groups are deviant in their creed, belief, methodology and behaviour. Indeed they extol pious people, honour the dead as they slaughter to them, and vow to them, and some even circumambulate around their graves. In addition to this, they recite innovated mention of Allaah which is rarely free of calling upon other than Allaah. Moreover, they hold some people in a rank that is as great as Allaah's and this is nothing but major Shirk (associating partners to Allaah) itself. For more details please refer to Fataawa 87244, 85140 and 82017.
As regards what you are experiencing, it might be that it is a physical or psychological disease, so you should consult doctors and it might be that you will find a cure Inshaa' Allaah. What you are experiencing could also be because of being possessed by a devil; in order to get rid of this, you should seek Ruqyah with the Book of Allaah and the Sunnah of the Prophet . The fact that you did not find a cure from the previous people who performed Ruqyah on you, does not mean that others could not be the means to cure you with the permission of Allaah with the use of Ruqyah. The Prophet said: "Allaah has not sent down any disease without sending a remedy for it; still some will know it and some will not." [Ahmad]
Finally, we do not think that there is any correlation between what happened to your colleague and to you.
May Allaah cure everyone.
Allaah Knows best.