I've been on Amitriptyline 10mgs now for probably 3 weeks. I'm also taking them with Solpadol (30mgs codeine/500mg paracetamol). If you want my honest answer, which I'm sure you do, I feel like sh*t. I feel depressed, which isn't helping because Amitriptyline is a antidepressant although it can also cause someone to get depressed - strange eh?
What you need to understand about that specific drug is that if the dose is increased or decreased it can take weeks, even a month or so to actually start working or take affect.
I just hope that your GP is better at his/her job than mine is because quite frankly I'm at the end of my tether. I wish you good luck Jenna because personally I think you're going to need it. I'm 24, I'm heathly (or was) and I'm plowing through 100 painkillers every 3-4 weeks and I'm not knocking back Amytriptyline - which like you are, for pain and not due to depression.