I can only tell you my experience. I did find some relief with seroquil but didn't want to have to keep increasing the dosage. Please, please don't stay with the benzoyl. You may think they are helping, they are a he'll I wouldn't wish on the devil.
After decades of anxiety, I found a Dr. who MADE ME STOP THE BENZOS. I will not lie, it was sheer agony but worth every minute of the torture. She then put me on hydroxyzine. I just knew it was a waste of time. But I started them. I was calmer, I slept better, my anxiety was still there just not as overwhelming. She taught me deep breathing that I could do anywhere.
I'm now 2 years of no benzoyl, I rarely take the hydrox.. I use the deep breathing often and that's fine.
I wish you the best in your health quest. Be very gentle with yourself. You really are worth it.