Re-reading AlieO's post- she does not say she has been taking some during the day- but that she is getting withdrawal symptoms in the afternoon, after taking 1 at night.
AllieO, I am so sorry you've been having such a sad and tough time, no wonder you needed help sleeping. Zopiclone is known to be highly addictive- but at the same time to really help some people. A friend of mine had the same issue, had been on half a tablet for years- and was so worried that she had panick attacks and couldn't sleep at all if she tried not to take one (well, half)- but the doctor told her not to worry, as long as she doesn't increase the dose and takes more and more- and it helps her sleep and get on with life during the day, then it was the lesser evil and not to worry.
Really, you shoud go and discuss this with your doctor, or ask to be referred to a sleep clinic, or another specialist. Don't 'accuse' the doctor of letting you be on them for too long, but tell him you are concerned- and about the anxiety attacks, which may well have nothing to do with the Zopiclone. It's good to be able to talk to others on GN, but for such medical issues, it is perhaps not a good idea.
go and ask for help, you deserve it- and take care.