Immigrant Visa

Hi, what happened to me is super weird, I went for an interview in the Consular (with my O1 already approved) on Nov 12, in the time of the interview the officer told me everything is ok i have been approved and they will send me my passport in 3-4 days with the new visa in it. After 2.5 hours am receiving an email from the consular saying that "although you were advised at the time of your interview that your visa was approved, we will not be able to issue your visa right away nor confirm its approval at the moment, Rest assured that we will contact you when a determination has been made on your visa application case." without explaining the reason they did this and how long it will take. Now its been 6 weeks and I still did not receive my visa or any update on the administrative processing website.
Anyone on the same page? I do not know what it going on and I am worried since I might lose my job there. Anyone knowing how long I might wait? Guys am super worried about this.