Tish,
I suggest you see a different GP in your practice and show them the NICE guidelines regarding Pregabalin. Your GP is trying to palm you off with a cheaper, old fashioned drug.
In my opinion Pregabalin has side effects which are not as horrendous as SSRIs and pass with time. It is not as addictive as Valium and is the best thing I have been given for anxiety.
I am not saying that Amitriptaline is not effective for anxiety and nerve pain, it also acts as an anti-depressant. But Pregabalin is the better more modern option.
Sarah