Where have I gone

I feel all askew lately.  I feel like I have lost who I am or at least who I thought I was.  My connections to people and even things feel all wrong. It is the holiday season and it just does not feel right.  Where is the joy, the excitement, the connection to family and even memories?  I am going through the motions in an effort to get the emotional switch to turn on but the energy is not there.  I am beginning to think that part of me has died and left this shell of who I once was behind. If I continue in this path until I leave this world will I just be done or is there a shadow of me somewhere that I can reconnect with on some other plane?  I feel horrifyingly empty.