I understand the way you feel, I remember being really desperate at some point and I still have moments when I am, thinking things will never improve. But each time I remind myself I have made progress / changes in a relatively small period. The first thing to fight is anxiety, because it's precisely what's keeping you in and worsens your condition. Then things will slowly move on and you will feel better. Another thing is, not to focus on it, the more you think about it, and the more stressed you will be.
I took an anti-psychotic, and it made a huge difference for me. I was afraid of taking meds due to this constant fear / insecurity DR can induce, but then I took it and it made a significant difference. Hasn't your psychiatrist suggested an antipsychotic ? If you're depressed as well, then of course you might as well need to take an antidepressant. I'm currently taking one, I still haven't observe any real improvement because it takes months before it does, but it really helps me not falling too deep into depression and thus slowly recover.
Try relaxation / meditation, it helps.
I hope your next appointment will help. And remember, you will beat this.