It depends on what he prescribed it for, if to help sleep, lower dose is effective has he told you to increase the dose gradually,or is this your decision. If you increase too fast it can make your blood pressure drop when you stand up, which would make you dizzy each time you stand up. I once fainted on a related antidepressant that I was advised to increase too quickly.
Also, Amitryptiline is relatively toxic and may not be possible to combine with certain other drugs in a high dose if that is what he has in mind and sometimes a combination works better.

I suggest you discuss your concerns with him in detail, write them down. I once wrote a letter to mine and gave it to him at the appointment when I felt it was important he got all my concerns. He took it well and it saved a lot of frustration. (I have found it is often more productive to make changes with their blessing than without and sometimes they will let you try something even if they don't completely agree. Which he didn't in my case, but let me try and it worked out).

Two weeks feels like an eternity, but it will pass each day comes to an end and each morning comes, whether you want it to or not.

Hang on in there. I have said a lot without too much information about your situation and bear in mind it is general information, you and your doctors know you best.
Good luck, the very best of luck and I hope you find a solution that works for you.