Thanks for your question on Healthcare Magic. I can understand your concern. Honestly speaking, there is no correlation between nuvigil intake and hard to take deep breath. Since you are having anxiety, sometimes uncontrolled stress and anxiety can also cause similar symptoms. Only drugs (anxiolytic) are not always sufficient to control anxiety symptoms. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on it s solution. Counselling plays very important role along with drugs to control anxiety. Don t worry, you will be alright. Avoid stress and tension, be relax and calm. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.