I have benign positional lightheadedness and migraine headaches. I have been prescribed nortriptyline 50 mg night to prevent for migrain headaches, but they seem to be a complication for lightheadedness. The migraines occur mostly in the early morning (3 - 5 mornings a week) which is leaving me sleep deprived. I prefer to take the nortriptyline to tamp down the headaches. However, I am concerned that taking it may cause unexpected or severe side effects with regard to the lightheaded ness. Any help would be appreciated.