I was prescribed Amitriptyline nearly 2 years ago to try and help with the burning pain and also not sleeping. It's an anti-depressant but is also used for neuropathic pain.
My body couldn't cope with the Amitriptyline and I developed a side effect of blurred vision that caused me to fall and injury my arm. I went to the Opticians who said my pupils were extremely dilated and told me to get my mum to call my Doctor ASAP. My Doctor told me to wean off the Amitriptyline and thankfully, my vision went OK after a few days of me coming off it.
I wish you the best of luck with the Amitriptyline and hope it helps you. I know some people have had success with it - I guess like with everything, no two people are going to react the same!
Take care and I hope your pain settles down soon!