It is said that complete healing of gaba receptors happens after the drug is completely out of the system, and likely once you finished your taper it took the drug a couple weeks to get out of your system: it is stored in fat tissue so the process takes awhile. Thus the sudden onset of symptoms, What you are experiencing is pretty normal, I'm told, I haven't got that far yet. Complete healing can take weeks to months. Here's the thing about taking more "rescue doses" once you've finished your taper: it stalls the healing of the receptors because you are once again supplying them with the gaba that has damaged them. Don't take any more benzo; I understand the distress caused by untenable insomnia, it drove me to reinstate the drug, which I regret deeply. If I had stuck to my guns, even at that level of distress, I would be healed by now.
Yes, do the CBT-I. ACT is another one. Even though your insomnia has a component that is drug induced, you are also having a lot of distress, and maybe some patterns of thinking and behaving that aren't helpful. It's almost inevitable that this level of insomnia goes hand in hand with anxiety about not sleeping, your nervous system is very ramped up and the anxiety further ramps it up, making sleep nearly impossible. Learn to address the anxiety, learn coping mechanisms for turning down your stress response. Very hard to do but worth the effort. Do things that calm you, that keep your thoughts in the RIGHT NOW, not on yesterday's difficulty or fear of what tonight or tomorrow will bring. Learn about mindfulness, deep abdominal breathing. meditation. Write about the good and the bad, remember to express gratitude, in writing, for the good things you have, like your husband sticking by your side through this (many of us are going through this process alone); spend time outside, move your body in whatever way you can; mindful walks are great as you take note of what you hear, see, smell, feel. Lean into your creativity, yes you do have creativity: draw, paint, sew, cook, build... I know it's hard to do this stuff when you are exhausted, do what you can. Some days I can't get off the couch, but I can write and sketch and practice deep breating and meditate. The idea is to get your mind off your trouble, because ruminating about this all day is ramping up your already fragile nervous system, that needs to heal. DO NOT take more lorazepam, it may give you relief in the very short term, but every time you take one of those it delays your healing and prolongs your suffering. Your idea about pursuing NON DRUG ways of calming your system is the correct direction. You've done an amazing thing, you have got off benzos. Hooray!! Celebrate that, your battle is moving toward its end. Hang on. Best ~