I started Xyrem a couple of days ago. The first night was ok I was nerves. The DR. also added Dexedrine 5mg 3x aday. The second night I didn't sleep at all. My breathing felt shallow and I felt anxiety. also I felt pressure building in my head and if I moved my head the pain eased up but would start to build again within minutes. Should I be concerned or is this normal? I have read the side effects info but im hoping someone has firsthand experience.