Need Help

I was an Interim team lead and my probation of 6 months just got completed today and 6 months ago I was told that after completion I will be the team Lead. Yesterday I was told that they are changing my team's department and due this there will be a new Team Lead. There is no team lead in that department they are promoting someone else to be the lead of my team.

Please suggest what should I do because all this feels so disrespecting and unfair.