I've taken Mirtazapine on and off for about 2 years after reading a post on here that read something like "Completely healed from a case of Diagnosed HPPD." Mirtazapine hasn't affected my visual symptoms positively or negatively. It helps me sleep and with depression. It does nothing for anxiety.
I'm not sure any non-benzo medications will help you with anxiety. Especially if you have used a benzo and can compare it to that. Just my two cents.