I don't know about the noritriptyline. I think I tried it once maybe but don't know a lot about it.

Just in case and because this helped me incredibly (I changed diagnosis from Chronic migraine to classic migraines and went from 25/month to just a few that rarely require more than advil or my triptan if I'm home), have you tried magnesium? Nice and bipolar safe and it really helps. I take 500 mg daily and the migraines decreased almost immediately. At this point (nearly 2 years later) I can count on 1 per month when I drive home from my pdoc in the dark or with shadowy flickering light from trees and sometimes that's my only one. That's a huge difference than 2 years ago when I spent almost all my time fighting one.

They gave me a few other natural suggestions I can't try because they could interact with my MAOI. I don't remember all but definitely CoQ10 (which caused some hypomania for me so be careful if you try it), butter balm, feverfew, melatonin. The magnesium, CoQ10 and melatonin was the recommended combination to start off. There are other natural things but I don't remember them.