Welcome to PC!
Are you planning on seeing a new therapist or psychiatrist in your new area? I ask because what you describe could be a few possibilities and somebody in real life will be better placed to help you understand what is happening to you.
One thing about schizoaffective disorder is that it can be either bipolar type (hypo/mania and depression) or depression (only) type. Depression can present as feeling numb/emotion-less, rather than feeling sadness.
I will admit that I know very little about schizoid personality disorder, but my impression was that people with that weren't bothered by their lack of sociability etc. Lack of motivation and social anxiety are just 2 of a number of explanations that can also cause a person to isolate themselves from others.
I am curious as to what happened 12 years ago when this all began? That's largely rhetorical because it may be too personal to share online, but I think your journey from where you were 12 years ago to where you are now could provide important clues to a therapist/Dr or even yourself as to what caused this.
More important though is working out where you want to go from here? What do you want to do with your life - what are your values and goals? Reconnecting with those will help you see what your next step is.
All the best
*Willow*