Blood Test for Carbamazepine (Tegretol)

About a week and a half ago my carbamazepine was upped from 200 mgs per day to 400 mgs per day. I take 200 mgs in the am and 200 mgs in the pm. My doc gave me and order to go in about a week to get blood test.

So I went today and before I could even get home there was a message on my phone. It was too late to call them back.

Over the last several days I've been having trouble with my eyes. They have been hurting, blurry and "bouncing" around. I looked that up online and it's called nystagmus.

So I started cymbalta the same day and I went up on the carbamazepine. I thought that maybe the cymbalta was causing the eye problems and I was really hoping that was not the problems as it is helping me so much! I can sleep better, my mood is better, etc.

After reading about the carbamazepine blood test I'm beginning to think that's the problem.

So what can my doctor do? I'm already on 400 mgs. per day of topamax for headaches / migraines. If I have to roll back the carbamazepine, then what?