Just know that it won't last forever! If the zopiclone isn't working then I wouldn't bother popping them just to snatch a couple hours of sleep, since in the long run you have to let your brain reach homeostasis before absolutely all of the symptoms like insomnia can settle down. Are you keeping busy in the day? I find exercising til I'm exhausted always helps me sleep like a baby when the time comes round so that might help you. Are you having any form of caffeine in the day? If you are then I'd suggest cutting it out immediately. I become way more sensitive to caffeine when I've stopped using opiates, to the point where I found that I couldn't have any at all after 4PM initially else I wouldn't be able to sleep, even at 1-2AM.
Other than that the only thing to do is persevere. It's horrendously frustrating and makes you feel like tearing your hair out, but it doesn't last forever. Your body will adjust. Your natural circadian rhythm will return. You can be confident that a point will come when you're falling asleep with zero problems, and you can look back at this period and just be glad that you stuck it out until your body came back to normality. You're doing the right thing! Keep going!