Hi, Thanks for posting in HCM. I understand your concern. Vyvanse contains lisdexamfetamine , which is a central nervous system stimulant. Usual side effects encountered with the use of this drug include: nausea, vomiting, constipation, stomach/abdominal pain, loss of appetite, dry mouth, headache, nervousness, dizziness, difficulty in sleeping, sweating, weight loss, irritability and restlessness. Since some of these effects are what you are experiencing, it would be better to seek medical attention promptly. Hope the information provided would be helpful. All the best.