Antisocial + schizophrenia + anxiety

Hi there @Zam, please bear with me as I am replying via phone to your post. Thanks @Former-Member for tagging me!
I've been diagnosed with schizoaffective disorder, a combination of schizophrenia and bipolar disorder. Before diagnosis and before any signs of ill mental health, I was a bit of a social butterfly really. I was always socially engaging and lots of friends and was surrounded by them. Fast forward eleven years and I'm pretty much a social leper. As much as I enjoyed parties and socialising, It seems nobody wants to hang out with someone who clearly isn't comfortable in their own skin.
My psychiatrist says my behaviours which lead me to be a social pariah and he has even said there will be more of a decline.

These behaviours include putting headphones on all the time in an attempt to drown out the voices I hear (which are always derogatory). I also can be distant towards people. I also get wreaked with anxiety to the point of vomiting when I'm in new places that I'm unprepared for.
That's a key word for me actually, preparation. I take oodles of preparation to do almost anything otherwise there's a very good chance that I'll chicken out.

I can definitely hear what you're saying and can definitely relate.