Recently, the neurologist prescribed me 10mg nortriptyline to help improve sleep and headache. i have been taking it nightly for 10 days. i have noticed that in the past week i have been more anxious than usual. how do i wean off of it?

That medication would typically not make you anxious, it is used to help anxiety. And likely you are anxious and this may be part of the cause of why you are having difficulty sleeping. The recommendation for weaning is to decrease by 25% each week. So do a week of 1/2 then one tablet alternating, then a week of half tablet daily, then half tablet every other day, then half tablet every 4 days x2.