It can be very difficult to have the benzo abruptly stopped with no strategy to replace it with. I am wondering if you have any insight into the reason why you are having these panic attacks. Did something stressful happen? Is it usually at a particular time of day? Anxiety is perpetuated by both biology and situational stress. Perhaps doing some work in therapy to assess what unconscious or automatic thoughts you could be having that are leading to the anxiety in the first place. I definitely don't mean to dismiss the biologic basis of what's going on but looking at the situational factors can help you take steps to mitigate other factors that may be responsible.

How do you breathe during the panic attack? I imagine you are probably breathing very rapidly. Slowing down the breathing to one breath every 4 seconds can be a way to sort of regain control. Once you are able to become more grounded, take your focus on your immediate surroundings. Take it in via your five senses. I know visual cues really help me, really paying attention to what is going on visually. Smells and feelings can also help as well as the other senses. Going for a walk. Sometimes it might come down to acceptance. Say to yourself you are in a state of anxiety, but don't reject or challenge it, just accept it.

Let me know if any of that helps.