Ok Bizz,
In my humble opinion lack of sleep is the one factor which will cause someone trying to do their rattle to throw the towel in and get back on the gear. If you can get sleepers off your doc and you reckon you can leave them when you are over the worst they may help. Zopiclone is less of a risk than Moggys (Nitrazepam) or the rest of the Benzos apparently although it works on the GABA receptors in your brain same as Benzos so I ain't sure about that but if my doc would have played ball that's what I would have asked for. If you stand no chance getting sleepers prescribed (I couldn't get them legally for love nor money cos of my history of abusing them) there are OTC sleep aids like Phenergan (sedating antihisthamine) and many others. See how you feel but I know how much of a nightmare the insomnia is, after all, keeping people awake is a well documented and used form of torture so if you are honest with your doc I am sure they might be sympathetic.
Sleep does return though eventually and natural sleep is worth triple the hours of chemically induced sleep. Whatever choice you make, you ain't alone Bizz and you got my support mate. Hang in there.
Good luck
Hope this helped
DD