Thank you for starting this thread, as I did find it hard to search for any Z related topics.
I took 1 Zopiclone tablet (3.75mg). This happened 2 months ago. I was already starting to suffer the following day after the first dose

It began with me noticing weird distorted sounds from every passing car while I was standing at the bus stop. I arrived [...] and I seemed to be ok, besides the fact that I was unusually tired. So I went to bed early, but while lying for more than 30min I noticed I cant sleep, on top of that a weird sounds in my ears suddenly started to buzz constantly.
I slept for 3 hours the following 2 nights until I was desperate enough to take another Z dose, since nothing was helping me to sleep - music, wine, valerian pills etc. But I only took a half of Z tablet, which didnt help at all. I was as sleepless as before
The worst was still to happen. While I struggled to calm down, I started to keep noticing more and more of distorted sounds around me. When I started my first day at the new job I had an intense panic attack where all sounds became distorted and loud, which made me take 2 days off. The loud attacks happened a few more times during that week of the first and last Z dose. Though they seemed to have moved away, I still could hear constant distortion when I heard background noise (like a fan, engine noise). And of course sleepless nights. This is when I ran into drinking lots of wine before going to bed, this was still all happening in the same week. I drank about 2-3 nights and I could only sleep 2 more hours, so around 5 hours per night.
But to be honest, I was not worried about sleeping as much as I did about my hearing. This made me so scared, I had constant death wish in my head...and plans on all the things I need to do before I die soon. The thought of not enjoying music as I did was just too depressing (Im an animator, so to do fun cartoons, I need to work with music).
Somehow I managed to survive, by talking with fellow workers as much as I could. I kept my mind away from myself and hoped that with time I would get [...]...after 2 months now I still hear distortion and my head still feels pressured, foggy and kind of strange

I have been feeling dead all this time, and though I managed to cope [...] with the dizziness and anxiety, I have daily phases when I feel terrified and hopeless that my life is over.
I do not know if this is normal for the Z drug to have such a long lasting effect, or if I am permanently disabled my hearing/brain function.