Hi Vivien,
I'm so sorry you're still having problems. Amitriptylene is not a sleeping pill, it's an anti-depressant, and I have taken it in the past.
In combination with zopiclone it didn't do anything useful. I was taking 125mg a day (prescribed) and it actually gave me hallucinations which comtinued into the next day ssometimes.
Everyone is different. I do understand your worry over your GP stopping the zopiclone - that's happened to me, too. It's terrifying, and it's very bad practice on the GP's part.
So, to sum up, I amm personally not of the opinion that amitriptyline is of great use, and it is also very dangerous in overdose. It has loads of other side-effects as well (have you googled it/) so for the moment I a wondering if you can change GPs? I don't know where you live. If it's a rural area and there's only one surgery you can attend, changing GPs will be impossible.
I have mentioned your difficulties at the clinic to the doctor who runs mine, and he is appalled, He said that everywhere is supposed to have such a clinic available, with an expert in charge and at least two GPs on board, whose job is not only to see and treat addicts but also to disseminate information amongst all the other GPs in the area. He admits that this isn't happening very quickly, but it's policy now.
That wasn't very helpful on a personal level to you, I know, but I thought you'd be interested.
Last resort - download and copy The Ashton Method and take it to show your GP.
There has to be a way out of this and I'm not giving up racking my brains until you get the treatment you need. Sorry I haven't been in touch lately, but I certainly haven't forgotten you.
Still thinking, love Tess.