Like buying and selling a boat, your two best days with Nielsen will be your first day and your last.
Was fortunate enough to part ways with the company recently, and can say looking back wished I would have left sooner. You realize how shady the management is even more once you leave, and hopefully I will never cross paths with them ever again.
Save yourself the stress and leave ASAP while figuring out another path forward. Nielsen is like an abusive spouse that once you break free from, you then realize how bad they were treating you. Good luck!